{"id":38178,"date":"2026-10-01T21:00:00","date_gmt":"2026-10-01T19:00:00","guid":{"rendered":"https:\/\/ludorex.com\/?p=38178"},"modified":"2026-09-25T19:46:50","modified_gmt":"2026-09-25T17:46:50","slug":"boi-so-cua-2","status":"publish","type":"post","link":"https:\/\/ludorex.com\/vi\/tro-choi\/boi-so-cua-2","title":{"rendered":"B\u1ed9i s\u1ed1 c\u1ee7a 2: cu\u1ed9c thi g\u1ea5p \u0111\u00f4i v\u00e0 chia h\u1ebft"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"38178\" class=\"elementor elementor-38178\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2b6d5809 e-flex e-con-boxed e-con e-parent\" data-id=\"2b6d5809\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-51b9df9 elementor-widget elementor-widget-spacer\" data-id=\"51b9df9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-36e44969 e-con-full e-flex e-con e-parent\" data-id=\"36e44969\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-42b16f56 e-con-full e-flex e-con e-child\" data-id=\"42b16f56\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-387d4e4c e-con-full e-flex e-con e-child\" data-id=\"387d4e4c\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;video&quot;,&quot;background_video_start&quot;:0,&quot;background_video_end&quot;:10,&quot;background_play_on_mobile&quot;:&quot;yes&quot;,&quot;background_privacy_mode&quot;:&quot;yes&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-25e1d305 elementor-widget elementor-widget-image\" data-id=\"25e1d305\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-2.jpg\" class=\"attachment-thumbnail size-thumbnail wp-image-38174\" alt=\"C\u00e2u h\u1ecfi ph\u00e9p chia v\u1edbi s\u1ed1 b\u1ecb chia \u1ea9n khi chia cho 2 b\u1eb1ng 3, c\u00f9ng hai l\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n 6 v\u00e0 9 trong c\u00e1c \u00f4 m\u00e0u v\u00e0ng\" srcset=\"https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-2.jpg 150w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-2-12x12.jpg 12w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-2-40x40.jpg 40w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-2-64x64.jpg 64w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-2-24x24.jpg 24w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-2-36x36.jpg 36w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-2-48x48.jpg 48w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4a496156 elementor-widget elementor-widget-icon-box\" data-id=\"4a496156\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-box-wrapper\">\n\n\t\t\t\n\t\t\t\t\t\t<div class=\"elementor-icon-box-content\">\n\n\t\t\t\t\t\t\t\t\t<h1 class=\"elementor-icon-box-title\">\n\t\t\t\t\t\t<span  >\n\t\t\t\t\t\t\tB\u1ed9i s\u1ed1 c\u1ee7a 2: cu\u1ed9c thi g\u1ea5p \u0111\u00f4i v\u00e0 chia h\u1ebft\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h1>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-65c6db6a elementor-align-center elementor-mobile-align-center elementor-widget elementor-widget-button\" data-id=\"65c6db6a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-md\" href=\"#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjM4MTc2IiwidG9nZ2xlIjpmYWxzZX0%3D\" rel=\"nofollow\" id=\"btnFullscreen\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-play\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M424.4 214.7L72.4 6.6C43.8-10.3 0 6.1 0 47.9V464c0 37.5 40.7 60.1 72.4 41.3l352-208c31.4-18.5 31.5-64.1 0-82.6z\"><\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Ch\u01a1i<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6b5a5db0 e-con-full e-flex e-con e-child\" data-id=\"6b5a5db0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-757cc055 e-flex e-con-boxed e-con e-parent\" data-id=\"757cc055\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-39e54949 e-con-full e-flex e-con e-child\" data-id=\"39e54949\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-290f63f0 elementor-widget elementor-widget-icon-box\" data-id=\"290f63f0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-box-wrapper\">\n\n\t\t\t\n\t\t\t\t\t\t<div class=\"elementor-icon-box-content\">\n\n\t\t\t\t\t\t\t\t\t<p class=\"elementor-icon-box-title\">\n\t\t\t\t\t\t<span  >\n\t\t\t\t\t\t\tB\u1ed9i s\u1ed1 c\u1ee7a 2: cu\u1ed9c thi g\u1ea5p \u0111\u00f4i v\u00e0 chia h\u1ebft\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-561f13f7 e-con-full e-flex e-con e-child\" data-id=\"561f13f7\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<main class=\"elementor-element elementor-element-4933ecd2 e-flex e-con-boxed e-con e-parent\" data-id=\"4933ecd2\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-1adc315 e-con-full e-flex e-con e-child\" data-id=\"1adc315\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e7abcd9 elementor-widget elementor-widget-breadcrumbs\" data-id=\"e7abcd9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"breadcrumbs.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p id=\"breadcrumbs\"><span><span><a href=\"https:\/\/ludorex.com\/vi\">Tr\u00f2 ch\u01a1i<\/a><\/span><\/span><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2214f91c elementor-share-buttons--view-icon elementor-share-buttons--shape-circle elementor-share-buttons--skin-gradient elementor-grid-0 elementor-share-buttons--color-official elementor-widget elementor-widget-share-buttons\" data-id=\"2214f91c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"share-buttons.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-grid\" role=\"list\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t\t<div class=\"elementor-share-btn elementor-share-btn_facebook\" role=\"button\" tabindex=\"0\" aria-label=\"Share on facebook\" data-no-translation-aria-label=\"\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-facebook\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256c0 123.78 90.69 226.38 209.25 245V327.69h-63V256h63v-54.64c0-62.15 37-96.48 93.67-96.48 27.14 0 55.52 4.84 55.52 4.84v61h-31.28c-30.8 0-40.41 19.12-40.41 38.73V256h68.78l-11 71.69h-57.78V501C413.31 482.38 504 379.78 504 256z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t\t<div class=\"elementor-share-btn elementor-share-btn_whatsapp\" role=\"button\" tabindex=\"0\" aria-label=\"Share on whatsapp\" data-no-translation-aria-label=\"\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-whatsapp\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M380.9 97.1C339 55.1 283.2 32 223.9 32c-122.4 0-222 99.6-222 222 0 39.1 10.2 77.3 29.6 111L0 480l117.7-30.9c32.4 17.7 68.9 27 106.1 27h.1c122.3 0 224.1-99.6 224.1-222 0-59.3-25.2-115-67.1-157zm-157 341.6c-33.2 0-65.7-8.9-94-25.7l-6.7-4-69.8 18.3L72 359.2l-4.4-7c-18.5-29.4-28.2-63.3-28.2-98.2 0-101.7 82.8-184.5 184.6-184.5 49.3 0 95.6 19.2 130.4 54.1 34.8 34.9 56.2 81.2 56.1 130.5 0 101.8-84.9 184.6-186.6 184.6zm101.2-138.2c-5.5-2.8-32.8-16.2-37.9-18-5.1-1.9-8.8-2.8-12.5 2.8-3.7 5.6-14.3 18-17.6 21.8-3.2 3.7-6.5 4.2-12 1.4-32.6-16.3-54-29.1-75.5-66-5.7-9.8 5.7-9.1 16.3-30.3 1.8-3.7.9-6.9-.5-9.7-1.4-2.8-12.5-30.1-17.1-41.2-4.5-10.8-9.1-9.3-12.5-9.5-3.2-.2-6.9-.2-10.6-.2-3.7 0-9.7 1.4-14.8 6.9-5.1 5.6-19.4 19-19.4 46.3 0 27.3 19.9 53.7 22.6 57.4 2.8 3.7 39.1 59.7 94.8 83.8 35.2 15.2 49 16.5 66.6 13.9 10.7-1.6 32.8-13.4 37.4-26.4 4.6-13 4.6-24.1 3.2-26.4-1.3-2.5-5-3.9-10.5-6.6z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t\t<div class=\"elementor-share-btn elementor-share-btn_x-twitter\" role=\"button\" tabindex=\"0\" aria-label=\"Share on x-twitter\" data-no-translation-aria-label=\"\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-x-twitter\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M389.2 48h70.6L305.6 224.2 487 464H345L233.7 318.6 106.5 464H35.8L200.7 275.5 26.8 48H172.4L272.9 180.9 389.2 48zM364.4 421.8h39.1L151.1 88h-42L364.4 421.8z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t\t<div class=\"elementor-share-btn elementor-share-btn_reddit\" role=\"button\" tabindex=\"0\" aria-label=\"Share on reddit\" data-no-translation-aria-label=\"\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-reddit\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M201.5 305.5c-13.8 0-24.9-11.1-24.9-24.6 0-13.8 11.1-24.9 24.9-24.9 13.6 0 24.6 11.1 24.6 24.9 0 13.6-11.1 24.6-24.6 24.6zM504 256c0 137-111 248-248 248S8 393 8 256 119 8 256 8s248 111 248 248zm-132.3-41.2c-9.4 0-17.7 3.9-23.8 10-22.4-15.5-52.6-25.5-86.1-26.6l17.4-78.3 55.4 12.5c0 13.6 11.1 24.6 24.6 24.6 13.8 0 24.9-11.3 24.9-24.9s-11.1-24.9-24.9-24.9c-9.7 0-18 5.8-22.1 13.8l-61.2-13.6c-3-.8-6.1 1.4-6.9 4.4l-19.1 86.4c-33.2 1.4-63.1 11.3-85.5 26.8-6.1-6.4-14.7-10.2-24.1-10.2-34.9 0-46.3 46.9-14.4 62.8-1.1 5-1.7 10.2-1.7 15.5 0 52.6 59.2 95.2 132 95.2 73.1 0 132.3-42.6 132.3-95.2 0-5.3-.6-10.8-1.9-15.8 31.3-16 19.8-62.5-14.9-62.5zM302.8 331c-18.2 18.2-76.1 17.9-93.6 0-2.2-2.2-6.1-2.2-8.3 0-2.5 2.5-2.5 6.4 0 8.6 22.8 22.8 87.3 22.8 110.2 0 2.5-2.2 2.5-6.1 0-8.6-2.2-2.2-6.1-2.2-8.3 0zm7.7-75c-13.6 0-24.6 11.1-24.6 24.9 0 13.6 11.1 24.6 24.6 24.6 13.8 0 24.9-11.1 24.9-24.6 0-13.8-11-24.9-24.9-24.9z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4ca34cff elementor-widget elementor-widget-text-editor\" data-id=\"4ca34cff\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>V\u1ec1 Tr\u00f2 Ch\u01a1i<\/h2><p>V\u1edbi tr\u00f2 ch\u01a1i <strong>b\u1ed9i s\u1ed1 c\u1ee7a 2<\/strong> b\u1ea1n s\u1ebd luy\u1ec7n t\u1eadp c\u00e1c s\u1ed1 ch\u1eb5n theo m\u1ed9t c\u00e1ch kh\u00e1c: thay v\u00ec \u0111\u1ecdc thu\u1ed9c d\u00e3y 2, 4, 6, 8\u2026, b\u1ea1n ph\u1ea3i t\u00ecm ra con s\u1ed1 \u1ea9n sau m\u1ed9t ph\u00e9p chia. Tr\u00ean m\u00e0n h\u00ecnh s\u1ebd xu\u1ea5t hi\u1ec7n m\u1ed9t ph\u00e9p t\u00ednh ki\u1ec3u nh\u01b0 <strong>? \u00f7 2 = 3<\/strong> v\u00e0 b\u1ea1n ph\u1ea3i ch\u1ecdn trong s\u1ed1 nhi\u1ec1u \u0111\u00e1p \u00e1n con s\u1ed1 l\u00e0m cho ph\u00e9p t\u00ednh \u0111\u00fang. Trong v\u00ed d\u1ee5 n\u00e0y, \u0111\u00e1p \u00e1n l\u00e0 6, v\u00ec 6 <strong>g\u1ea5p \u0111\u00f4i<\/strong> s\u1ed1 3. \u0110\u00e2y l\u00e0 c\u00e1ch \u00f4n t\u1eadp ho\u00e0n h\u1ea3o <span style=\"text-decoration: underline; color: #000080;\"><a style=\"color: #000080;\" href=\"https:\/\/ludorex.com\/vi\/tag\/bang-cuu-chuong-2\"><strong><span style=\"color: #000080; text-decoration: underline;\">b\u1ea3ng nh\u00e2n 2<\/span><\/strong><\/a><\/span> theo chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i, \u0111\u00fang l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 b\u1eaft \u0111\u1ea7u chia s\u1ed1 m\u1ed9t c\u00e1ch th\u00e0nh th\u1ea1o.<\/p><p>Tr\u00f2 ch\u01a1i c\u00f3 d\u1ea1ng <strong>cu\u1ed9c thi \u0111\u1ed1 vui<\/strong>: m\u1ed7i c\u00e2u \u0111\u00fang \u0111\u01b0\u1ee3c c\u1ed9ng \u0111i\u1ec3m v\u00e0 m\u1ed7i l\u1ea7n sai gi\u00fap b\u1ea1n nh\u1eadn ra nh\u1eefng ph\u00e9p g\u1ea5p \u0111\u00f4i n\u00e0o m\u00ecnh ch\u01b0a thu\u1ed9c l\u00f2ng.<\/p><h2>C\u00e1ch ch\u01a1i B\u1ed9i s\u1ed1 c\u1ee7a 2 nh\u01b0 th\u1ebf n\u00e0o?<\/h2><ol><li>\u0110\u1ecdc ph\u00e9p chia xu\u1ea5t hi\u1ec7n \u1edf ph\u00eda tr\u00ean: s\u1ed1 b\u1ecb chia lu\u00f4n b\u1ecb thi\u1ebfu.<\/li><li>Suy ngh\u0129 xem s\u1ed1 n\u00e0o chia cho 2 th\u00ec ra k\u1ebft qu\u1ea3 \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb.<\/li><li>Nh\u1ea5n v\u00e0o \u00f4 c\u00f3 \u0111\u00e1p \u00e1n \u0111\u00fang trong s\u1ed1 c\u00e1c l\u1ef1a ch\u1ecdn.<\/li><li>Chuy\u1ec3n sang c\u00e2u h\u1ecfi ti\u1ebfp theo v\u00e0 c\u1ed1 g\u1eafng ho\u00e0n th\u00e0nh cu\u1ed9c thi v\u1edbi nhi\u1ec1u c\u00e2u \u0111\u00fang nh\u1ea5t.<\/li><\/ol><h2>\u0110i\u1ec1u khi\u1ec3n<\/h2><h3>PC<\/h3><ul><li><strong>Nh\u1ea5p chu\u1ed9t:<\/strong> <strong>ch\u1ecdn \u0111\u00e1p \u00e1n<\/strong><\/li><\/ul><h3>\u0110i\u1ec7n tho\u1ea1i v\u00e0 m\u00e1y t\u00ednh b\u1ea3ng<\/h3><ul><li><strong>Ch\u1ea1m m\u00e0n h\u00ecnh:<\/strong> <strong>ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang<\/strong><\/li><\/ul><h2>H\u1ecdc \u0111\u01b0\u1ee3c g\u00ec?<\/h2><ul><li>Nh\u1eadn bi\u1ebft c\u00e1c <strong>b\u1ed9i s\u1ed1 c\u1ee7a 2<\/strong> v\u00e0 hi\u1ec3u r\u1eb1ng t\u1ea5t c\u1ea3 \u0111\u1ec1u l\u00e0 <strong>s\u1ed1 ch\u1eb5n<\/strong>.<\/li><li>Li\u00ean h\u1ec7 ph\u00e9p nh\u00e2n v\u00e0 ph\u00e9p chia: n\u1ebfu 2 \u00d7 7 = 14 th\u00ec 14 \u00f7 2 = 7.<\/li><li>T\u00ednh nh\u1ea9m nhanh g\u1ea5p \u0111\u00f4i v\u00e0 m\u1ed9t n\u1eeda.<\/li><li>Lo\u1ea1i b\u1ecf c\u00e1c l\u1ef1a ch\u1ecdn kh\u00f4ng th\u1ec3 b\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng m\u1ed9t quy t\u1eafc (s\u1ed1 l\u1ebb kh\u00f4ng bao gi\u1edd l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a 2).<\/li><\/ul><p>Ph\u00f9 h\u1ee3p cho tr\u1ebb t\u1eeb 7 tu\u1ed5i, khi \u0111\u00e3 thu\u1ed9c b\u1ea3ng nh\u00e2n 2 v\u00e0 b\u1eaft \u0111\u1ea7u h\u1ecdc nh\u1eefng ph\u00e9p chia \u0111\u1ea7u ti\u00ean.<\/p><h2>M\u1eb9o \u0111\u1ec3 ch\u01a1i t\u1ed1t h\u01a1n<\/h2><ul><li><strong>Nh\u00ecn ch\u1eef s\u1ed1 cu\u1ed1i<\/strong>: b\u1ed9i s\u1ed1 c\u1ee7a 2 lu\u00f4n c\u00f3 t\u1eadn c\u00f9ng l\u00e0 <strong>0, 2, 4, 6 ho\u1eb7c 8<\/strong>. N\u1ebfu m\u1ed9t l\u1ef1a ch\u1ecdn c\u00f3 t\u1eadn c\u00f9ng l\u00e0 1, 3, 5, 7 ho\u1eb7c 9, b\u1ea1n c\u00f3 th\u1ec3 lo\u1ea1i ngay m\u00e0 kh\u00f4ng c\u1ea7n t\u00ednh.<\/li><li><strong>H\u00e3y ngh\u0129 theo ph\u00e9p g\u1ea5p \u0111\u00f4i, \u0111\u1eebng ngh\u0129 theo ph\u00e9p chia<\/strong>: khi g\u1eb7p \u201c? \u00f7 2 = 8\u201d, h\u00e3y t\u1ef1 h\u1ecfi \u201cg\u1ea5p \u0111\u00f4i 8 l\u00e0 bao nhi\u00eau?\u201d. C\u1ed9ng s\u1ed1 \u0111\u00f3 v\u1edbi ch\u00ednh n\u00f3 (8 + 8 = 16) nhanh h\u01a1n l\u00e0 chia.<\/li><li><strong>V\u1edbi k\u1ebft qu\u1ea3 l\u1edbn, h\u00e3y t\u00e1ch s\u1ed1<\/strong>: g\u1ea5p \u0111\u00f4i 13 b\u1eb1ng g\u1ea5p \u0111\u00f4i 10 c\u1ed9ng g\u1ea5p \u0111\u00f4i 3, t\u1ee9c l\u00e0 20 + 6 = 26.<\/li><li><strong>D\u00f9ng v\u00ed d\u1ee5 \u0111\u1eddi th\u01b0\u1eddng<\/strong>: c\u00e1c \u0111\u00f4i t\u1ea5t, b\u00e1nh xe \u0111\u1ea1p hay \u0111\u00f4i m\u1eaft tr\u00ean khu\u00f4n m\u1eb7t. \u0110\u1ebfm c\u00e1ch hai b\u1eb1ng \u0111\u1ed3 v\u1eadt th\u1eadt gi\u00fap c\u00e1c b\u00e9 r\u1ea5t nhi\u1ec1u.<\/li><\/ul><h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2><h3>B\u1ed9i s\u1ed1 c\u1ee7a 2 l\u00e0 nh\u1eefng s\u1ed1 n\u00e0o?<\/h3><p>\u0110\u00f3 l\u00e0 c\u00e1c s\u1ed1 c\u00f3 \u0111\u01b0\u1ee3c khi nh\u00e2n 2 v\u1edbi b\u1ea5t k\u1ef3 s\u1ed1 t\u1ef1 nhi\u00ean n\u00e0o: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20\u2026 v\u00e0 c\u1ee9 th\u1ebf \u0111\u1ebfn v\u00f4 h\u1ea1n. N\u00f3i c\u00e1ch kh\u00e1c, \u0111\u00f3 l\u00e0 t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 ch\u1eb5n.<\/p><h3>L\u00e0m sao bi\u1ebft m\u1ed9t s\u1ed1 c\u00f3 ph\u1ea3i l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a 2 kh\u00f4ng?<\/h3><p>Ch\u1ec9 c\u1ea7n nh\u00ecn ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng. N\u1ebfu t\u1eadn c\u00f9ng l\u00e0 0, 2, 4, 6 ho\u1eb7c 8 th\u00ec \u0111\u00f3 l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a 2 v\u00e0 chia h\u1ebft cho 2 m\u00e0 kh\u00f4ng d\u01b0. V\u00ed d\u1ee5, 348 l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a 2; 351 th\u00ec kh\u00f4ng.<\/p><h3>B\u1ed9i s\u1ed1 c\u1ee7a 2 v\u00e0 \u01b0\u1edbc s\u1ed1 c\u1ee7a 2 kh\u00e1c nhau th\u1ebf n\u00e0o?<\/h3><p>B\u1ed9i s\u1ed1 c\u1ee7a 2 l\u00e0 v\u00f4 h\u1ea1n (2, 4, 6\u2026), c\u00f2n \u01b0\u1edbc s\u1ed1 c\u1ee7a 2 ch\u1ec9 c\u00f3 hai: 1 v\u00e0 ch\u00ednh s\u1ed1 2. Trong tr\u00f2 ch\u01a1i n\u00e0y, b\u1ea1n luy\u1ec7n t\u1eadp b\u1ed9i s\u1ed1, t\u1ee9c l\u00e0 nh\u1eefng s\u1ed1 \u201cch\u1ee9a\u201d tr\u1ecdn s\u1ed1 2 m\u1ed9t s\u1ed1 nguy\u00ean l\u1ea7n.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a223bee elementor-widget elementor-widget-text-editor\" data-id=\"a223bee\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Th\u00f4ng tin b\u1ed5 sung<\/h2><p><strong>Th\u1ec3 lo\u1ea1i:<\/strong> Gi\u00e1o d\u1ee5c to\u00e1n h\u1ecdc, \u0111\u1ed1 vui<br \/><strong>\u0110\u1ed9 tu\u1ed5i khuy\u1ebfn ngh\u1ecb:<\/strong> T\u1eeb 7 tu\u1ed5i tr\u1edf l\u00ean<br \/><strong>C\u00f4ng ngh\u1ec7:<\/strong> HTML5<br \/><strong>N\u1ec1n t\u1ea3ng:<\/strong> Tr\u00ecnh duy\u1ec7t web (PC, m\u00e1y t\u00ednh b\u1ea3ng v\u00e0 \u0111i\u1ec7n tho\u1ea1i)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-384aecb6 elementor-widget elementor-widget-heading\" data-id=\"384aecb6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">C\u1eadp nh\u1eadt m\u1edbi nh\u1ea5t<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-343c4a31 elementor-align-left elementor-widget elementor-widget-post-info\" data-id=\"343c4a31\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-228f13f elementor-inline-item\" itemprop=\"datePublished\">\n\t\t\t\t\t\t<a href=\"https:\/\/ludorex.com\/vi\/2026\/10\/01\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-calendar\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M12 192h424c6.6 0 12 5.4 12 12v260c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V204c0-6.6 5.4-12 12-12zm436-44v-36c0-26.5-21.5-48-48-48h-48V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H160V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H48C21.5 64 0 85.5 0 112v36c0 6.6 5.4 12 12 12h424c6.6 0 12-5.4 12-12z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-date\">\n\t\t\t\t\t\t\t\t\t\t<time>Th\u00e1ng 10 1, 2026<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-4358513 elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-clock\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm0 448c-110.5 0-200-89.5-200-200S145.5 56 256 56s200 89.5 200 200-89.5 200-200 200zm61.8-104.4l-84.9-61.7c-3.1-2.3-4.9-5.9-4.9-9.7V116c0-6.6 5.4-12 12-12h32c6.6 0 12 5.4 12 12v141.7l66.8 48.6c5.4 3.9 6.5 11.4 2.6 16.8L334.6 349c-3.9 5.3-11.4 6.5-16.8 2.6z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-time\">\n\t\t\t\t\t\t\t\t\t\t<time>9:00 chi\u1ec1u<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5fdb4504 elementor-widget elementor-widget-heading\" data-id=\"5fdb4504\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">T\u00e1c gi\u1ea3:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c4e71af elementor-author-box--avatar-yes elementor-author-box--name-yes elementor-author-box--biography-yes elementor-author-box--link-no elementor-widget elementor-widget-author-box\" data-id=\"c4e71af\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"author-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-author-box\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/ludorex.com\/vi\/ve-toi\" target=\"_blank\" class=\"elementor-author-box__avatar\">\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/secure.gravatar.com\/avatar\/8ebb79153d837d98bee34a35135159df6b950eb623ae2f21bce22a5ff645bbdb?s=300&#038;d=wavatar&#038;r=g\" alt=\"Picture of Rub\u00e9n Cabra Zamora\" loading=\"lazy\">\n\t\t\t\t<\/a>\n\t\t\t\n\t\t\t<div class=\"elementor-author-box__text\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/ludorex.com\/vi\/ve-toi\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-author-box__name\">\n\t\t\t\t\t\t\tRub\u00e9n Cabra Zamora\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-author-box__bio\">\n\t\t\t\t\t\tNg\u01b0\u1eddi s\u00e1ng t\u1ea1o n\u1ed9i dung tr\u00f2 ch\u01a1i \u0111i\u1ec7n t\u1eed | Nh\u00e0 ph\u00e1t tri\u1ec3n web | Gi\u00e1m \u0111\u1ed1c \u0111i\u1ec1u h\u00e0nh Ludorex | Chuy\u00ean gia SEO &amp; AI t\u1ea1i Internet Rep\u00fablica. \u0110am m\u00ea c\u00f4ng ngh\u1ec7 v\u00e0 tr\u00f2 ch\u01a1i \u0111i\u1ec7n t\u1eed, \u0111\u1ed3ng th\u1eddi cam k\u1ebft gi\u00fap c\u00e1c doanh nghi\u1ec7p ph\u00e1t 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