CINXE.COM

<!DOCTYPE html> <html class="client-nojs vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available" lang="vi" dir="ltr"> <head> <meta charset="UTF-8"> <title>289 (số) – Wikipedia tiếng Việt</title> <script>(function(){var className="client-js vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available";var cookie=document.cookie.match(/(?:^|; )viwikimwclientpreferences=([^;]+)/);if(cookie){cookie[1].split('%2C').forEach(function(pref){className=className.replace(new RegExp('(^| )'+pref.replace(/-clientpref-\w+$|[^\w-]+/g,'')+'-clientpref-\\w+( |$)'),'$1'+pref+'$2');});}document.documentElement.className=className;}());RLCONF={"wgBreakFrames":false,"wgSeparatorTransformTable":[",\t.",".\t,"],"wgDigitTransformTable":["",""], "wgDefaultDateFormat":"vi normal","wgMonthNames":["","tháng 1","tháng 2","tháng 3","tháng 4","tháng 5","tháng 6","tháng 7","tháng 8","tháng 9","tháng 10","tháng 11","tháng 12"],"wgRequestId":"fcd89a47-bec8-4361-b1c5-0b0d10eef555","wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"289_(số)","wgTitle":"289 (số)","wgCurRevisionId":71746485,"wgRevisionId":71746485,"wgArticleId":3367311,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["Số nguyên"],"wgPageViewLanguage":"vi","wgPageContentLanguage":"vi","wgPageContentModel":"wikitext","wgRelevantPageName":"289_(số)","wgRelevantArticleId":3367311,"wgIsProbablyEditable":true,"wgRelevantPageIsProbablyEditable":true,"wgRestrictionEdit":[],"wgRestrictionMove":[],"wgNoticeProject":"wikipedia","wgCiteReferencePreviewsActive":false,"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgPopupsFlags":0, "wgVisualEditor":{"pageLanguageCode":"vi","pageLanguageDir":"ltr","pageVariantFallbacks":"vi"},"wgMFDisplayWikibaseDescriptions":{"search":true,"watchlist":true,"tagline":true,"nearby":true},"wgWMESchemaEditAttemptStepOversample":false,"wgWMEPageLength":400,"wgRelatedArticlesCompat":[],"wgEditSubmitButtonLabelPublish":true,"wgULSPosition":"interlanguage","wgULSisCompactLinksEnabled":false,"wgVector2022LanguageInHeader":true,"wgULSisLanguageSelectorEmpty":false,"wgWikibaseItemId":"Q239004","wgCheckUserClientHintsHeadersJsApi":["brands","architecture","bitness","fullVersionList","mobile","model","platform","platformVersion"],"GEHomepageSuggestedEditsEnableTopics":true,"wgGETopicsMatchModeEnabled":false,"wgGEStructuredTaskRejectionReasonTextInputEnabled":false,"wgGELevelingUpEnabledForUser":false};RLSTATE={"ext.gadget.charinsert-styles":"ready","ext.globalCssJs.user.styles":"ready","site.styles":"ready","user.styles":"ready","ext.globalCssJs.user":"ready","user":"ready","user.options": "loading","skins.vector.search.codex.styles":"ready","skins.vector.styles":"ready","skins.vector.icons":"ready","ext.wikimediamessages.styles":"ready","ext.visualEditor.desktopArticleTarget.noscript":"ready","ext.uls.interlanguage":"ready","wikibase.client.init":"ready","ext.wikimediaBadges":"ready"};RLPAGEMODULES=["site","mediawiki.page.ready","skins.vector.js","ext.centralNotice.geoIP","ext.centralNotice.startUp","ext.gadget.did_you_mean","ext.gadget.ReferenceTooltips","ext.gadget.AVIM","ext.gadget.AVIM_portlet","ext.gadget.charinsert","ext.gadget.refToolbar","ext.gadget.wikibugs","ext.gadget.purgetab","ext.gadget.switcher","ext.gadget.AdvancedSiteNotices","ext.urlShortener.toolbar","ext.centralauth.centralautologin","ext.popups","ext.visualEditor.desktopArticleTarget.init","ext.visualEditor.targetLoader","ext.echo.centralauth","ext.eventLogging","ext.wikimediaEvents","ext.navigationTiming","ext.uls.interface","ext.cx.eventlogging.campaigns","ext.cx.uls.quick.actions", "wikibase.client.vector-2022","ext.checkUser.clientHints","ext.growthExperiments.SuggestedEditSession","wikibase.sidebar.tracking"];</script> <script>(RLQ=window.RLQ||[]).push(function(){mw.loader.impl(function(){return["user.options@12s5i",function($,jQuery,require,module){mw.user.tokens.set({"patrolToken":"+\\","watchToken":"+\\","csrfToken":"+\\"}); }];});});</script> <link rel="stylesheet" href="/w/load.php?lang=vi&modules=ext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cskins.vector.icons%2Cstyles%7Cskins.vector.search.codex.styles%7Cwikibase.client.init&only=styles&skin=vector-2022"> <script async="" src="/w/load.php?lang=vi&modules=startup&only=scripts&raw=1&skin=vector-2022"></script> <meta name="ResourceLoaderDynamicStyles" content=""> <link rel="stylesheet" href="/w/load.php?lang=vi&modules=ext.gadget.charinsert-styles&only=styles&skin=vector-2022"> <link rel="stylesheet" href="/w/load.php?lang=vi&modules=site.styles&only=styles&skin=vector-2022"> <meta name="generator" content="MediaWiki 1.44.0-wmf.5"> <meta name="referrer" content="origin"> <meta name="referrer" content="origin-when-cross-origin"> <meta name="robots" content="max-image-preview:standard"> <meta name="format-detection" content="telephone=no"> <meta name="viewport" content="width=1120"> <meta property="og:title" content="289 (số) – Wikipedia tiếng Việt"> <meta property="og:type" content="website"> <link rel="alternate" media="only screen and (max-width: 640px)" href="//vi.m.wikipedia.org/wiki/289_(s%E1%BB%91)"> <link rel="alternate" type="application/x-wiki" title="Sửa đổi" href="/w/index.php?title=289_(s%E1%BB%91)&action=edit"> <link rel="apple-touch-icon" href="/static/apple-touch/wikipedia.png"> <link rel="icon" href="/static/favicon/wikipedia.ico"> <link rel="search" type="application/opensearchdescription+xml" href="/w/rest.php/v1/search" title="Wikipedia (vi)"> <link rel="EditURI" type="application/rsd+xml" href="//vi.wikipedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://vi.wikipedia.org/wiki/289_(s%E1%BB%91)"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/deed.vi"> <link rel="alternate" type="application/atom+xml" title="Nguồn cấp Atom của Wikipedia" href="/w/index.php?title=%C4%90%E1%BA%B7c_bi%E1%BB%87t:Thay_%C4%91%E1%BB%95i_g%E1%BA%A7n_%C4%91%C3%A2y&feed=atom"> <link rel="dns-prefetch" href="//meta.wikimedia.org" /> <link rel="dns-prefetch" href="//login.wikimedia.org"> </head> <body class="skin--responsive skin-vector skin-vector-search-vue mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-289_số rootpage-289_số skin-vector-2022 action-view"><a class="mw-jump-link" href="#bodyContent">Bước tới nội dung</a> <div class="vector-header-container"> <header class="vector-header mw-header"> <div class="vector-header-start"> <nav class="vector-main-menu-landmark" aria-label="Trang Web"> <div id="vector-main-menu-dropdown" class="vector-dropdown vector-main-menu-dropdown vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Trình đơn chính" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-menu mw-ui-icon-wikimedia-menu"></span> <span class="vector-dropdown-label-text">Trình đơn chính</span> </label> <div class="vector-dropdown-content"> <div id="vector-main-menu-unpinned-container" class="vector-unpinned-container"> <div id="vector-main-menu" class="vector-main-menu vector-pinnable-element"> <div class="vector-pinnable-header vector-main-menu-pinnable-header vector-pinnable-header-unpinned" data-feature-name="main-menu-pinned" data-pinnable-element-id="vector-main-menu" data-pinned-container-id="vector-main-menu-pinned-container" data-unpinned-container-id="vector-main-menu-unpinned-container" > <div class="vector-pinnable-header-label">Trình đơn chính</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">chuyển sang thanh bên</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">ẩn</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Điều hướng </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Trang_Ch%C3%ADnh" title="Xem trang chính [z]" accesskey="z"><span>Trang Chính</span></a></li><li id="n-wikipedia-featuredcontent" class="mw-list-item"><a href="/wiki/C%E1%BB%95ng_th%C3%B4ng_tin:N%E1%BB%99i_dung_ch%E1%BB%8Dn_l%E1%BB%8Dc"><span>Nội dung chọn lọc</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:Ng%E1%BA%ABu_nhi%C3%AAn" title="Xem trang ngẫu nhiên [x]" accesskey="x"><span>Bài viết ngẫu nhiên</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:Thay_%C4%91%E1%BB%95i_g%E1%BA%A7n_%C4%91%C3%A2y" title="Danh sách thay đổi gần đây trong wiki [r]" accesskey="r"><span>Thay đổi gần đây</span></a></li><li id="n-bug_in_article" class="mw-list-item"><a href="/wiki/Wikipedia:B%C3%A1o_l%E1%BB%97i_b%C3%A0i_vi%E1%BA%BFt"><span>Báo lỗi nội dung</span></a></li> </ul> </div> </div> <div id="p-wikipedia-interaction" class="vector-menu mw-portlet mw-portlet-wikipedia-interaction" > <div class="vector-menu-heading"> Tương tác </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-wikipedia-helppage" class="mw-list-item"><a href="/wiki/Wikipedia:S%C3%A1ch_h%C6%B0%E1%BB%9Bng_d%E1%BA%ABn"><span>Hướng dẫn</span></a></li><li id="n-aboutsite" class="mw-list-item"><a href="/wiki/Wikipedia:Gi%E1%BB%9Bi_thi%E1%BB%87u"><span>Giới thiệu Wikipedia</span></a></li><li id="n-portal" class="mw-list-item"><a href="/wiki/Wikipedia:C%E1%BB%99ng_%C4%91%E1%BB%93ng" title="Giới thiệu dự án, cách sử dụng và tìm kiếm thông tin ở đây"><span>Cộng đồng</span></a></li><li id="n-wikipedia-villagepump" class="mw-list-item"><a href="/wiki/Wikipedia:Th%E1%BA%A3o_lu%E1%BA%ADn"><span>Thảo luận chung</span></a></li><li id="n-wikipedia-helpdesk" class="mw-list-item"><a href="/wiki/Wikipedia:Gi%C3%BAp_s%E1%BB%AD_d%E1%BB%A5ng_Wikipedia"><span>Giúp sử dụng</span></a></li><li id="n-contactpage" class="mw-list-item"><a href="//vi.wikipedia.org/wiki/Wikipedia:Liên_lạc"><span>Liên lạc</span></a></li><li id="n-upload" class="mw-list-item"><a href="/wiki/Wikipedia:Tr%C3%ACnh_t%E1%BA%A3i_l%C3%AAn_t%E1%BA%ADp_tin"><span>Tải lên tập tin</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Trang_Ch%C3%ADnh" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Wikipedia" src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" style="width: 7.5em; height: 1.125em;"> <img class="mw-logo-tagline" alt="Bách khoa toàn thư mở" src="/static/images/mobile/copyright/wikipedia-tagline-vi.svg" width="120" height="10" style="width: 7.5em; height: 0.625em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:T%C3%ACm_ki%E1%BA%BFm" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Tìm kiếm Wikipedia [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Tìm kiếm</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Tìm kiếm trên Wikipedia" aria-label="Tìm kiếm trên Wikipedia" autocapitalize="sentences" title="Tìm kiếm Wikipedia [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Đặc_biệt:Tìm_kiếm"> </div> <button class="cdx-button cdx-search-input__end-button">Tìm kiếm</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Công cụ cá nhân"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Giao diện"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Giao diện" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Giao diện</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_vi.wikipedia.org&uselang=vi" class=""><span>Quyên góp</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=%C4%90%E1%BA%B7c_bi%E1%BB%87t:M%E1%BB%9F_t%C3%A0i_kho%E1%BA%A3n&returnto=289+%28s%E1%BB%91%29" title="Bạn được khuyến khích mở tài khoản và đăng nhập; tuy nhiên, không bắt buộc phải có tài khoản" class=""><span>Tạo tài khoản</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=%C4%90%E1%BA%B7c_bi%E1%BB%87t:%C4%90%C4%83ng_nh%E1%BA%ADp&returnto=289+%28s%E1%BB%91%29" title="Đăng nhập sẽ có lợi hơn, tuy nhiên không bắt buộc. [o]" accesskey="o" class=""><span>Đăng nhập</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Thêm tùy chọn" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Công cụ cá nhân" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Công cụ cá nhân</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Bảng chọn thành viên" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_vi.wikipedia.org&uselang=vi"><span>Quyên góp</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%C4%90%E1%BA%B7c_bi%E1%BB%87t:M%E1%BB%9F_t%C3%A0i_kho%E1%BA%A3n&returnto=289+%28s%E1%BB%91%29" title="Bạn được khuyến khích mở tài khoản và đăng nhập; tuy nhiên, không bắt buộc phải có tài khoản"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Tạo tài khoản</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%C4%90%E1%BA%B7c_bi%E1%BB%87t:%C4%90%C4%83ng_nh%E1%BA%ADp&returnto=289+%28s%E1%BB%91%29" title="Đăng nhập sẽ có lợi hơn, tuy nhiên không bắt buộc. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Đăng nhập</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Trang dành cho người dùng chưa đăng nhập <a href="/wiki/Tr%E1%BB%A3_gi%C3%BAp:Gi%E1%BB%9Bi_thi%E1%BB%87u" aria-label="Tìm hiểu thêm về sửa đổi"><span>tìm hiểu thêm</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:%C4%90%C3%B3ng_g%C3%B3p_c%E1%BB%A7a_t%C3%B4i" title="Danh sách các sửa đổi được thực hiện qua địa chỉ IP này [y]" accesskey="y"><span>Đóng góp</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:Th%E1%BA%A3o_lu%E1%BA%ADn_t%C3%B4i" title="Thảo luận với địa chỉ IP này [n]" accesskey="n"><span>Thảo luận cho địa chỉ IP này</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Trang Web"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Nội dung" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Nội dung</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">chuyển sang thanh bên</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">ẩn</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Đầu</div> </a> </li> <li id="toc-Trong_toán_học" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Trong_toán_học"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Trong toán học</span> </div> </a> <ul id="toc-Trong_toán_học-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Tham_khảo" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Tham_khảo"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Tham khảo</span> </div> </a> <ul id="toc-Tham_khảo-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Nội dung" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Đóng mở mục lục" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Đóng mở mục lục</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">289 (số)</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Xem bài viết trong ngôn ngữ khác. Bài có sẵn trong 26 ngôn ngữ" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-26" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">26 ngôn ngữ</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/289_(%D8%B9%D8%AF%D8%AF)" title="289 (عدد) – Tiếng Ả Rập" lang="ar" hreflang="ar" data-title="289 (عدد)" data-language-autonym="العربية" data-language-local-name="Tiếng Ả Rập" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/289_(%C9%99d%C9%99d)" title="289 (ədəd) – Tiếng Azerbaijan" lang="az" hreflang="az" data-title="289 (ədəd)" data-language-autonym="Azərbaycanca" data-language-local-name="Tiếng Azerbaijan" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/289_(nombor)" title="289 (nombor) – Tiếng Mã Lai" lang="ms" hreflang="ms" data-title="289 (nombor)" data-language-autonym="Bahasa Melayu" data-language-local-name="Tiếng Mã Lai" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/289" title="289 – Tiếng Mân Nam" lang="nan" hreflang="nan" data-title="289" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="Tiếng Mân Nam" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/289_(%C4%8D%C3%ADslo)" title="289 (číslo) – Tiếng Séc" lang="cs" hreflang="cs" data-title="289 (číslo)" data-language-autonym="Čeština" data-language-local-name="Tiếng Séc" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-eml mw-list-item"><a href="https://eml.wikipedia.org/wiki/289_(n%C3%B9mer)" title="289 (nùmer) – Emiliano-Romagnolo" lang="egl" hreflang="egl" data-title="289 (nùmer)" data-language-autonym="Emiliàn e rumagnòl" data-language-local-name="Emiliano-Romagnolo" class="interlanguage-link-target"><span>Emiliàn e rumagnòl</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/289_(number)" title="289 (number) – Tiếng Anh" lang="en" hreflang="en" data-title="289 (number)" data-language-autonym="English" data-language-local-name="Tiếng Anh" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Berrehun_eta_laurogeita_bederatzi" title="Berrehun eta laurogeita bederatzi – Tiếng Basque" lang="eu" hreflang="eu" data-title="Berrehun eta laurogeita bederatzi" data-language-autonym="Euskara" data-language-local-name="Tiếng Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/289" title="289 – Tiếng Hàn" lang="ko" hreflang="ko" data-title="289" data-language-autonym="한국어" data-language-local-name="Tiếng Hàn" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/289_(numero)" title="289 (numero) – Tiếng Italy" lang="it" hreflang="it" data-title="289 (numero)" data-language-autonym="Italiano" data-language-local-name="Tiếng Italy" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Mia_mbili_na_themanini_na_tisa" title="Mia mbili na themanini na tisa – Tiếng Swahili" lang="sw" hreflang="sw" data-title="Mia mbili na themanini na tisa" data-language-autonym="Kiswahili" data-language-local-name="Tiếng Swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/289_(nonm)" title="289 (nonm) – Tiếng Haiti" lang="ht" hreflang="ht" data-title="289 (nonm)" data-language-autonym="Kreyòl ayisyen" data-language-local-name="Tiếng Haiti" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/289_(sz%C3%A1m)" title="289 (szám) – Tiếng Hungary" lang="hu" hreflang="hu" data-title="289 (szám)" data-language-autonym="Magyar" data-language-local-name="Tiếng Hungary" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/289_(%D0%B1%D1%80%D0%BE%D1%98)" title="289 (број) – Tiếng Macedonia" lang="mk" hreflang="mk" data-title="289 (број)" data-language-autonym="Македонски" data-language-local-name="Tiếng Macedonia" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mzn mw-list-item"><a href="https://mzn.wikipedia.org/wiki/%DB%B2%DB%B8%DB%B9_(%D8%B9%D8%AF%D8%AF)" title="۲۸۹ (عدد) – Tiếng Mazanderani" lang="mzn" hreflang="mzn" data-title="۲۸۹ (عدد)" data-language-autonym="مازِرونی" data-language-local-name="Tiếng Mazanderani" class="interlanguage-link-target"><span>مازِرونی</span></a></li><li class="interlanguage-link interwiki-mni mw-list-item"><a href="https://mni.wikipedia.org/wiki/%EA%AF%B2%EA%AF%B8%EA%AF%B9" title="꯲꯸꯹ – Tiếng Manipuri" lang="mni" hreflang="mni" data-title="꯲꯸꯹" data-language-autonym="ꯃꯤꯇꯩ ꯂꯣꯟ" data-language-local-name="Tiếng Manipuri" class="interlanguage-link-target"><span>ꯃꯤꯇꯩ ꯂꯣꯟ</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/289" title="289 – Mindong" lang="cdo" hreflang="cdo" data-title="289" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="Mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/289" title="289 – Tiếng Nhật" lang="ja" hreflang="ja" data-title="289" data-language-autonym="日本語" data-language-local-name="Tiếng Nhật" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/289_(son)" title="289 (son) – Tiếng Uzbek" lang="uz" hreflang="uz" data-title="289 (son)" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Tiếng Uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-nso mw-list-item"><a href="https://nso.wikipedia.org/wiki/289_(nomoro)" title="289 (nomoro) – Tiếng Sotho Miền Bắc" lang="nso" hreflang="nso" data-title="289 (nomoro)" data-language-autonym="Sesotho sa Leboa" data-language-local-name="Tiếng Sotho Miền Bắc" class="interlanguage-link-target"><span>Sesotho sa Leboa</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D9%A2%D9%A8%D9%A9_(%DA%98%D9%85%D8%A7%D8%B1%DB%95)" title="٢٨٩ (ژمارە) – Tiếng Kurd Miền Trung" lang="ckb" hreflang="ckb" data-title="٢٨٩ (ژمارە)" data-language-autonym="کوردی" data-language-local-name="Tiếng Kurd Miền Trung" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/289_(tal)" title="289 (tal) – Tiếng Thụy Điển" lang="sv" hreflang="sv" data-title="289 (tal)" data-language-autonym="Svenska" data-language-local-name="Tiếng Thụy Điển" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/289_(%D1%81%D0%B0%D0%BD)" title="289 (сан) – Tiếng Tatar" lang="tt" hreflang="tt" data-title="289 (сан)" data-language-autonym="Татарча / tatarça" data-language-local-name="Tiếng Tatar" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/289_(%D8%B9%D8%AF%D8%AF)" title="289 (عدد) – Tiếng Urdu" lang="ur" hreflang="ur" data-title="289 (عدد)" data-language-autonym="اردو" data-language-local-name="Tiếng Urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/289" title="289 – Tiếng Quảng Đông" lang="yue" hreflang="yue" data-title="289" data-language-autonym="粵語" data-language-local-name="Tiếng Quảng Đông" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/289" title="289 – Tiếng Trung" lang="zh" hreflang="zh" data-title="289" data-language-autonym="中文" data-language-local-name="Tiếng Trung" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q239004#sitelinks-wikipedia" title="Sửa liên kết giữa ngôn ngữ" class="wbc-editpage">Sửa liên kết</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Không gian tên"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/289_(s%E1%BB%91)" title="Xem bài viết [c]" accesskey="c"><span>Bài viết</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Th%E1%BA%A3o_lu%E1%BA%ADn:289_(s%E1%BB%91)&action=edit&redlink=1" rel="discussion" class="new" title="Thảo luận về trang này (trang không tồn tại) [t]" accesskey="t"><span>Thảo luận</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Thay đổi biến thể ngôn ngữ" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Tiếng Việt</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Giao diện"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/289_(s%E1%BB%91)"><span>Đọc</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=289_(s%E1%BB%91)&veaction=edit" title="Sửa đổi trang này [v]" accesskey="v"><span>Sửa đổi</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=289_(s%E1%BB%91)&action=edit" title="Sửa đổi mã nguồn của trang này [e]" accesskey="e"><span>Sửa mã nguồn</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=289_(s%E1%BB%91)&action=history" title="Các phiên bản cũ của trang này [h]" accesskey="h"><span>Xem lịch sử</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Công cụ trang"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Công cụ" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Công cụ</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Công cụ</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">chuyển sang thanh bên</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">ẩn</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Thêm tùy chọn" > <div class="vector-menu-heading"> Tác vụ </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/289_(s%E1%BB%91)"><span>Đọc</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=289_(s%E1%BB%91)&veaction=edit" title="Sửa đổi trang này [v]" accesskey="v"><span>Sửa đổi</span></a></li><li id="ca-more-edit" class="collapsible vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=289_(s%E1%BB%91)&action=edit" title="Sửa đổi mã nguồn của trang này [e]" accesskey="e"><span>Sửa mã nguồn</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=289_(s%E1%BB%91)&action=history"><span>Xem lịch sử</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Chung </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:Li%C3%AAn_k%E1%BA%BFt_%C4%91%E1%BA%BFn_%C4%91%C3%A2y/289_(s%E1%BB%91)" title="Các trang liên kết đến đây [j]" accesskey="j"><span>Các liên kết đến đây</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:Thay_%C4%91%E1%BB%95i_li%C3%AAn_quan/289_(s%E1%BB%91)" rel="nofollow" title="Thay đổi gần đây của các trang liên kết đến đây [k]" accesskey="k"><span>Thay đổi liên quan</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:Trang_%C4%91%E1%BA%B7c_bi%E1%BB%87t" title="Một danh sách chứa tất cả trang đặc biệt [q]" accesskey="q"><span>Trang đặc biệt</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=289_(s%E1%BB%91)&oldid=71746485" title="Liên kết thường trực đến phiên bản này của trang"><span>Liên kết thường trực</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=289_(s%E1%BB%91)&action=info" title="Thêm chi tiết về trang này"><span>Thông tin trang</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=%C4%90%E1%BA%B7c_bi%E1%BB%87t:Tr%C3%ADch_d%E1%BA%ABn&page=289_%28s%E1%BB%91%29&id=71746485&wpFormIdentifier=titleform" title="Hướng dẫn cách trích dẫn trang này"><span>Trích dẫn trang này</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=%C4%90%E1%BA%B7c_bi%E1%BB%87t:UrlShortener&url=https%3A%2F%2Fvi.wikipedia.org%2Fwiki%2F289_%28s%25E1%25BB%2591%29"><span>Lấy URL ngắn gọn</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=%C4%90%E1%BA%B7c_bi%E1%BB%87t:QrCode&url=https%3A%2F%2Fvi.wikipedia.org%2Fwiki%2F289_%28s%25E1%25BB%2591%29"><span>Tải mã QR</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> In và xuất </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=%C4%90%E1%BA%B7c_bi%E1%BB%87t:S%C3%A1ch&bookcmd=book_creator&referer=289+%28s%E1%BB%91%29"><span>Tạo một quyển sách</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=%C4%90%E1%BA%B7c_bi%E1%BB%87t:DownloadAsPdf&page=289_%28s%E1%BB%91%29&action=show-download-screen"><span>Tải dưới dạng PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=289_(s%E1%BB%91)&printable=yes" title="Bản để in ra của trang [p]" accesskey="p"><span>Bản để in ra</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> Tại dự án khác </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:289_(number)" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q239004" title="Liên kết đến khoản mục kết nối trong kho dữ liệu [g]" accesskey="g"><span>Khoản mục Wikidata</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Công cụ trang"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Giao diện"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Giao diện</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">chuyển sang thanh bên</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">ẩn</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Bách khoa toàn thư mở Wikipedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="vi" dir="ltr"><table class="infobox" style="width:22em"><tbody><tr><th colspan="2" style="padding:12px;text-align:center;vertical-align:middle;line-height:1.1em;font-size:135%;font-weight:bold;color:black;background-color:#e9e9e9;">289</th></tr><tr><th scope="row">Số đếm</th><td>289<br />hai trăm tám mươi chín</td></tr><tr><th scope="row">Số thứ tự</th><td>thứ hai trăm tám mươi chín</td></tr><tr><th scope="row">Bình phương</th><td>83521 (số)</td></tr><tr><th scope="row">Lập phương</th><td>24137569 (số)</td></tr><tr><th colspan="2" style="text-align:center;padding:5px;background-color:#e9e9e9;">Tính chất</th></tr><tr><th scope="row"><a href="/wiki/Ph%C3%A2n_t%C3%ADch_nh%C3%A2n_t%E1%BB%AD" title="Phân tích nhân tử">Phân tích nhân tử</a></th><td>17<sup>2</sup></td></tr><tr><th scope="row"><a href="/wiki/Chia_h%E1%BA%BFt" title="Chia hết">Chia hết cho</a></th><td>1, 17, 289</td></tr><tr><th colspan="2" style="text-align:center;padding:5px;background-color:#e9e9e9;">Biểu diễn</th></tr><tr><th scope="row"><a href="/wiki/H%E1%BB%87_nh%E1%BB%8B_ph%C3%A2n" title="Hệ nhị phân">Nhị phân</a></th><td>100100001<sub>2</sub></td></tr><tr><th scope="row"><a href="/wiki/H%E1%BB%87_tam_ph%C3%A2n" title="Hệ tam phân">Tam phân</a></th><td>101201<sub>3</sub></td></tr><tr><th scope="row"><a href="/wiki/H%E1%BB%87_t%E1%BB%A9_ph%C3%A2n" title="Hệ tứ phân">Tứ phân</a></th><td>10201<sub>4</sub></td></tr><tr><th scope="row"><a href="/w/index.php?title=H%E1%BB%87_ng%C5%A9_ph%C3%A2n&action=edit&redlink=1" class="new" title="Hệ ngũ phân (trang không tồn tại)">Ngũ phân</a></th><td>2124<sub>5</sub></td></tr><tr><th scope="row"><a href="/wiki/H%E1%BB%87_l%E1%BB%A5c_ph%C3%A2n" title="Hệ lục phân">Lục phân</a></th><td>1201<sub>6</sub></td></tr><tr><th scope="row"><a href="/wiki/H%E1%BB%87_b%C3%A1t_ph%C3%A2n" title="Hệ bát phân">Bát phân</a></th><td>441<sub>8</sub></td></tr><tr><th scope="row"><a href="/wiki/H%E1%BB%87_th%E1%BA%ADp_nh%E1%BB%8B_ph%C3%A2n" title="Hệ thập nhị phân">Thập nhị phân</a></th><td>201<sub>12</sub></td></tr><tr><th scope="row"><a href="/wiki/H%E1%BB%87_th%E1%BA%ADp_l%E1%BB%A5c_ph%C3%A2n" title="Hệ thập lục phân">Thập lục phân</a></th><td>121<sub>16</sub></td></tr><tr><th scope="row"><a href="/wiki/H%E1%BB%87_nh%E1%BB%8B_th%E1%BA%ADp_ph%C3%A2n" title="Hệ nhị thập phân">Nhị thập phân</a></th><td>E9<sub>20</sub></td></tr><tr><th scope="row"><a href="/wiki/H%E1%BB%87_c%C6%A1_s%E1%BB%91_36" class="mw-redirect" title="Hệ cơ số 36">Cơ số 36</a></th><td>81<sub>36</sub></td></tr><tr><th scope="row"><a href="/wiki/H%E1%BB%87_l%E1%BB%A5c_th%E1%BA%ADp_ph%C3%A2n" title="Hệ lục thập phân">Lục thập phân</a></th><td>4<u>N</u><sub>60</sub></td></tr><tr><th scope="row"><a href="/wiki/S%E1%BB%91_La_M%C3%A3" title="Số La Mã">Số La Mã</a></th><td>CCLXXXIX</td></tr><tr><td colspan="2" style="text-align:center"><div style="clear:both;"></div> <table style="width:100%; text-align:center; background-color:transparent; border:0; margin:0; padding:0; font-size:0.8em"> <tbody><tr style="vertical-align:top"> <td style="width:33%; padding:0.2em 0.1em 0.2em 0;"><a href="/wiki/288_(s%E1%BB%91)" title="288 (số)">288</a> </td> <td style="width:33%; padding:0.2em 0.1em; background-color:#e9e9e9; font-weight:bold;">289 </td> <td style="width:33%; padding:0.2em 0 0.2em 0.1em;"><a href="/wiki/290_(s%E1%BB%91)" title="290 (số)">290</a> </td></tr></tbody></table></td></tr></tbody></table> <p><b>289</b> (<b>hai trăm tám mươi chín</b>) là một <a href="/wiki/S%E1%BB%91_t%E1%BB%B1_nhi%C3%AAn" title="Số tự nhiên">số tự nhiên</a> liền sau <a href="/wiki/288_(s%E1%BB%91)" title="288 (số)">288</a> và liền trước <a href="/wiki/290_(s%E1%BB%91)" title="290 (số)">290</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Trong_toán_học"><span id="Trong_to.C3.A1n_h.E1.BB.8Dc"></span>Trong toán học</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=289_(s%E1%BB%91)&veaction=edit&section=1" title="Sửa đổi phần “Trong toán học”" class="mw-editsection-visualeditor"><span>sửa</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=289_(s%E1%BB%91)&action=edit&section=1" title="Sửa mã nguồn tại đề mục: Trong toán học"><span>sửa mã nguồn</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Khai_c%C4%83n" class="mw-redirect" title="Khai căn">Căn bậc hai</a> của 289 là 17.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Tham_khảo"><span id="Tham_kh.E1.BA.A3o"></span>Tham khảo</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=289_(s%E1%BB%91)&veaction=edit&section=2" title="Sửa đổi phần “Tham khảo”" class="mw-editsection-visualeditor"><span>sửa</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=289_(s%E1%BB%91)&action=edit&section=2" title="Sửa mã nguồn tại đề mục: Tham khảo"><span>sửa mã nguồn</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r71728118">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist" style="list-style-type: decimal;"> </div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Lấy từ “<a dir="ltr" href="https://vi.wikipedia.org/w/index.php?title=289_(số)&oldid=71746485">https://vi.wikipedia.org/w/index.php?title=289_(số)&oldid=71746485</a>”</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:Th%E1%BB%83_lo%E1%BA%A1i" title="Đặc biệt:Thể loại">Thể loại</a>: <ul><li><a href="/wiki/Th%E1%BB%83_lo%E1%BA%A1i:S%E1%BB%91_nguy%C3%AAn" title="Thể loại:Số nguyên">Số nguyên</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Trang này được sửa đổi lần cuối vào ngày 13 tháng 9 năm 2024, 02:37.</li> <li id="footer-info-copyright">Văn bản được phát hành theo <a href="/wiki/Wikipedia:Nguy%C3%AAn_v%C4%83n_Gi%E1%BA%A5y_ph%C3%A9p_Creative_Commons_Ghi_c%C3%B4ng%E2%80%93Chia_s%E1%BA%BB_t%C6%B0%C6%A1ng_t%E1%BB%B1_phi%C3%AAn_b%E1%BA%A3n_4.0_Qu%E1%BB%91c_t%E1%BA%BF" title="Wikipedia:Nguyên văn Giấy phép Creative Commons Ghi công–Chia sẻ tương tự phiên bản 4.0 Quốc tế">Giấy phép Creative Commons Ghi công–Chia sẻ tương tự</a>; có thể áp dụng điều khoản bổ sung. Với việc sử dụng trang web này, bạn chấp nhận <a class="external text" href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Terms_of_Use/vi">Điều khoản Sử dụng</a> và <a class="external text" href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy/vi">Quy định quyền riêng tư</a>. Wikipedia® là thương hiệu đã đăng ký của <a rel="nofollow" class="external text" href="https://www.wikimediafoundation.org/">Wikimedia Foundation, Inc.</a>, một tổ chức phi lợi nhuận.</li> </ul> <ul id="footer-places"> <li id="footer-places-privacy"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">Quy định quyền riêng tư</a></li> <li id="footer-places-about"><a href="/wiki/Wikipedia:Gi%E1%BB%9Bi_thi%E1%BB%87u">Giới thiệu Wikipedia</a></li> <li id="footer-places-disclaimers"><a href="/wiki/Wikipedia:Ph%E1%BB%A7_nh%E1%BA%ADn_chung">Lời phủ nhận</a></li> <li id="footer-places-wm-codeofconduct"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Universal_Code_of_Conduct">Bộ Quy tắc Ứng xử Chung</a></li> <li id="footer-places-developers"><a href="https://developer.wikimedia.org">Lập trình viên</a></li> <li id="footer-places-statslink"><a href="https://stats.wikimedia.org/#/vi.wikipedia.org">Thống kê</a></li> <li id="footer-places-cookiestatement"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Cookie_statement">Tuyên bố về cookie</a></li> <li id="footer-places-mobileview"><a href="//vi.m.wikipedia.org/w/index.php?title=289_(s%E1%BB%91)&mobileaction=toggle_view_mobile" class="noprint stopMobileRedirectToggle">Phiên bản di động</a></li> </ul> <ul id="footer-icons" class="noprint"> <li id="footer-copyrightico"><a href="https://wikimediafoundation.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/static/images/footer/wikimedia-button.svg" width="84" height="29" alt="Wikimedia Foundation" loading="lazy"></a></li> <li id="footer-poweredbyico"><a href="https://www.mediawiki.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/w/resources/assets/poweredby_mediawiki.svg" alt="Powered by MediaWiki" width="88" height="31" loading="lazy"></a></li> </ul> </footer> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> </div><script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-59bbd5969d-5l6pl","wgBackendResponseTime":154,"wgPageParseReport":{"limitreport":{"cputime":"0.097","walltime":"0.155","ppvisitednodes":{"value":774,"limit":1000000},"postexpandincludesize":{"value":8289,"limit":2097152},"templateargumentsize":{"value":225,"limit":2097152},"expansiondepth":{"value":11,"limit":100},"expensivefunctioncount":{"value":0,"limit":500},"unstrip-depth":{"value":0,"limit":20},"unstrip-size":{"value":961,"limit":5000000},"entityaccesscount":{"value":0,"limit":400},"timingprofile":["100.00% 138.624 1 -total"," 89.81% 124.505 1 Bản_mẫu:Số"," 66.62% 92.354 1 Bản_mẫu:Hộp_thông_tin"," 10.10% 13.997 1 Bản_mẫu:Tham_khảo"," 6.93% 9.606 2 Bản_mẫu:Số_sang_chữ"," 4.89% 6.775 1 Bản_mẫu:Nhị_phân"," 4.72% 6.548 1 Bản_mẫu:Lục_thập_phân"," 4.02% 5.569 1 Bản_mẫu:Chữ_số_La_Mã"," 2.92% 4.047 1 Bản_mẫu:Thập_lục_phân"," 2.57% 3.562 1 Bản_mẫu:Tứ_phân"]},"scribunto":{"limitreport-timeusage":{"value":"0.018","limit":"10.000"},"limitreport-memusage":{"value":1287905,"limit":52428800}},"cachereport":{"origin":"mw-web.codfw.main-694cf4987f-v8fq6","timestamp":"20241126100224","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"289 (s\u1ed1)","url":"https:\/\/vi.wikipedia.org\/wiki\/289_(s%E1%BB%91)","sameAs":"http:\/\/www.wikidata.org\/entity\/Q239004","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q239004","author":{"@type":"Organization","name":"Nh\u1eefng ng\u01b0\u1eddi \u0111\u00f3ng g\u00f3p v\u00e0o c\u00e1c d\u1ef1 \u00e1n Wikimedia"},"publisher":{"@type":"Organization","name":"Qu\u1ef9 Wikimedia","logo":{"@type":"ImageObject","url":"https:\/\/www.wikimedia.org\/static\/images\/wmf-hor-googpub.png"}},"datePublished":"2016-04-02T03:23:46Z","dateModified":"2024-09-13T02:37:00Z","headline":"s\u1ed1 t\u1ef1 nhi\u00ean"}</script> </body> </html>