{"id":25532,"date":"2021-12-24T17:11:18","date_gmt":"2021-12-24T10:11:18","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=25532"},"modified":"2021-12-24T17:11:19","modified_gmt":"2021-12-24T10:11:19","slug":"bai-so-18-do-vui-luyen-tri-thong-minh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/bai-so-18-do-vui-luyen-tri-thong-minh\/","title":{"rendered":"B\u00c0I S\u1ed0 18 &#8211; \u0110\u1ed1 vui luy\u1ec7n tr\u00ed th\u00f4ng minh"},"content":{"rendered":"<h3><a id=\"post-25532-CAU_1_17\"><\/a>C\u00c2U 1:<\/h3>\n<p>A logic v\u1edbi B. V\u1eady C ph\u1ea3i logic v\u1edbi nh\u00f3m n\u00e0o trong s\u1ed1 c\u00e1c nh\u00f3m 1, 2, 3, 4?<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" width=\"568\" height=\"142\" class=\"wp-image-25533\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/35-jpg.jpeg\" alt=\"35.jpg\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/35-jpg.jpeg 568w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/35-jpg-300x75.jpeg 300w\" sizes=\"(max-width: 568px) 100vw, 568px\" \/><\/p>\n<h3><a id=\"post-25532-CAU_2_17\"><\/a>C\u00c2U 2:<\/h3>\n<p>C\u00f3 2 ng\u00f4i l\u00e0ng c\u00e1ch nhau 1 c\u00e2y c\u1ea7u. Ai mu\u1ed1n \u0111i t\u1eeb l\u00e0ng n\u00e0y sang l\u00e0ng kia ph\u1ea3i \u0111i qua c\u00e2y c\u1ea7u \u0111\u00f3 v\u00e0 c\u00f3 1 con qu\u1ef7 \u1edf gi\u1eefa c\u1ea7u, c\u1ee9 ai \u0111i qua c\u1ea7u l\u00e0 n\u00f3 h\u1ea5t l\u1ea1i v\u1ec1 ch\u1ed7 c\u0169&#8230; H\u1ecfi l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111i \u0111\u01b0\u1ee3c qua c\u1ea7u \u0111\u1ec3 sang l\u00e0ng b\u00ean?<\/p>\n<h3><a id=\"post-25532-CAU_3_17\"><\/a>C\u00c2U 3:<\/h3>\n<p>Trong b\u00e3i g\u1eedi xe c\u00f3 3 lo\u1ea1i xe:<\/p>\n<p>+ Lo\u1ea1i th\u1ee9 nh\u1ea5t: c\u00f3 2 \u0111\u00e8n, 3 b\u00e1nh<\/p>\n<p>+ Lo\u1ea1i th\u1ee9 hai: c\u00f3 2 \u0111\u00e8n, 4 b\u00e1nh<\/p>\n<p>+ Lo\u1ea1i th\u1ee9 ba: c\u00f3 3 \u0111\u00e8n, 4 b\u00e1nh Ng\u01b0\u1eddi ta \u0111\u1ebfm \u0111\u01b0\u1ee3c 15 xe, 36 \u0111\u00e8n, 56 b\u00e1nh.<\/p>\n<p>H\u1ecfi s\u1ed1 xe m\u1ed7i lo\u1ea1i l\u00e0 bao nhi\u00eau?<\/p>\n<h3><a id=\"post-25532-CAU_4_15\"><\/a>C\u00c2U 4:<\/h3>\n<p>Hai ch\u1ee5c chia cho ph\u00e2n n\u1eeda c\u1ed9ng th\u00eam n\u0103m b\u1eb1ng bao nhi\u00eau?<\/p>\n<h3><a id=\"post-25532-CAU_5_9\"><\/a>C\u00c2U 5:<\/h3>\n<p>Trong m\u1ed9t n\u0103m d\u01b0\u01a1ng l\u1ecbch c\u00f3 th\u00e1ng 30 ng\u00e0y v\u00e0 th\u00e1ng 31 ng\u00e0y. V\u1eady \u0111\u1ed1 r\u1eb1ng c\u00f3 m\u1ea5y th\u00e1ng c\u00f3 28 ng\u00e0y.<\/p>\n<h1>H\u01af\u1edaNG D\u1eaaN &#8211; B\u00c0I GI\u1ea2I &#8211; \u0110\u00c1P S\u1ed0<\/h1>\n<h2><a id=\"post-25532-BAI_SO_18_1\"><\/a>B\u00c0I S\u1ed0 18<\/h2>\n<h3><a id=\"post-25532-CAU_1_57\"><\/a>C\u00c2U 1:<\/h3>\n<p>Ta th\u1ea5y c\u00e1c h\u00ecnh \u1edf A \u0111\u1ed5i ch\u1ed7 cho nhau theo ng\u01b0\u1ee3c chi\u1ec1u kim \u0111\u1ed3ng h\u1ed3 s\u1ebd \u0111\u01b0\u1ee3c v\u1ecb tr\u00ed nh\u01b0 \u1edf b. T\u1eeb h\u00ecnh C, ta c\u0169ng cho c\u00e1c h\u00ecnh \u0111\u1ed5i ch\u1ed7 cho nhau theo quy lu\u1eadt \u0111\u00f3 th\u00ec s\u1ebd \u0111\u01b0\u1ee3c v\u1ecb tr\u00ed c\u00e1c h\u00ecnh nh\u01b0 \u1edf nh\u00f3m 2.<\/p>\n<p>V\u1eady ta s\u1ebd ch\u1ecdn nh\u00f3m 2 l\u00e0 h\u1ee3p l\u00fd.<\/p>\n<h3><a id=\"post-25532-CAU_2_56\"><\/a>C\u00c2U 2:<\/h3>\n<p>B\u00e0i gi\u1ea3i:<\/p>\n<p>Mu\u1ed1n \u0111i t\u1eeb l\u00e0ng b\u00ean n\u00e0y sang l\u00e0ng b\u00ean kia m\u00e0 tr\u00ean c\u1ea7u l\u1ea1i c\u00f3 con qu\u1ef7 h\u1ea5t l\u1ea1i kh\u00f4ng cho qua th\u00ec khi \u0111i \u0111\u1ebfn gi\u1eefa c\u1ea7u ph\u1ea3i quay \u0111\u1ea7u l\u1ea1i nh\u00ecn ra ph\u00eda sau m\u00e0 \u0111i.<\/p>\n<h3><a id=\"post-25532-CAU_3_57\"><\/a>C\u00c2U 3:<\/h3>\n<p>B\u00e0i gi\u1ea3i:<\/p>\n<p>B\u00e0i to\u00e1n n\u00e0y gi\u1ea3i b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3 thi\u1ebft t\u1ea1m, c\u00f3 nhi\u1ec1u c\u00e1ch \u0111\u1ec3 gi\u1ea3i, sau \u0111\u00e2y l\u00e0 m\u1ed9t trong c\u00e1c c\u00e1ch gi\u1ea3i \u0111\u1ec3 c\u00e1c b\u1ea1n tham kh\u1ea3o:<\/p>\n<p>S\u1ed1 b\u00e1nh xe b\u1ecb h\u1ee5t \u0111i l\u00e0: 56 &#8211; 45 = 11 (b\u00e1nh).<\/p>\n<p>S\u1ed1 b\u00e1nh xe b\u1ecb h\u1ee5t \u0111i l\u00e0 do ta \u0111\u00e3 b\u1ecf b\u1edbt m\u1ed9t b\u00e1nh xe \u1edf m\u1ed7i xe 4 b\u00e1nh.<\/p>\n<p>Nh\u01b0 v\u1eady s\u1ed1 xe 4 b\u00e1nh l\u00e0: 11 : 1 = 11 (chi\u1ebfc)<\/p>\n<p>S\u1ed1 xe 3 b\u00e1nh l\u00e0: 15 &#8211; 11 = 4 (chi\u1ebfc)<\/p>\n<p>S\u1ed1 \u0111\u00e8n c\u1ee7a c\u00e1c xe 3 b\u00e1nh l\u00e0: 2 x 4 = 8 (\u0111\u00e8n).<\/p>\n<p>S\u1ed1 \u0111\u00e8n c\u1ee7a c\u00e1c xe 4 b\u00e1nh l\u00e0: 36 &#8211; 8 = 28 (\u0111\u00e8n)<\/p>\n<p>Gi\u1ea3 s\u1eed 11 xe 4 b\u00e1nh \u0111\u1ec1u c\u00f3 2 \u0111\u00e8n th\u00ec t\u1ed5ng s\u1ed1 \u0111\u00e8n c\u1ee7a ch\u00fang l\u00e0:<\/p>\n<p>2 x 11 = 22 (\u0111\u00e8n).<\/p>\n<p>S\u1ed1 \u0111\u00e8n h\u1ee5t \u0111i l\u00e0: 28 &#8211; 22 = 6 (\u0111\u00e8n).<\/p>\n<p>S\u1ed1 \u0111\u00e8n c\u1ee7a c\u00e1c xe 4 b\u00e1nh b\u1ecb h\u1ee5t \u0111i l\u00e0 do ta \u0111\u00e3 b\u1ecf b\u1edbt \u1edf m\u1ed7i xe 4 b\u00e1nh m\u1ed9t \u0111\u00e8n, nh\u01b0 v\u1eady c\u00f3 6 xe 3 \u0111\u00e8n 4 b\u00e1nh b\u1ecb b\u1ecf b\u1edbt \u0111\u00e8n. S\u1ed1 xe 2 \u0111\u00e8n 4 b\u00e1nh l\u00e0: 11 &#8211; 6 = 5 (xe).<\/p>\n<p>\u0110\u00e1p s\u1ed1:<\/p>\n<p>4 xe 2 \u0111\u00e8n 3 b\u00e1nh<\/p>\n<p>5 xe 2 \u0111\u00e8n 4 b\u00e1nh<\/p>\n<p>6 xe 3 \u0111\u00e8n 4 b\u00e1nh.<\/p>\n<h3><a id=\"post-25532-CAU_4_52\"><\/a>C\u00c2U 4:<\/h3>\n<p>\u0110\u00e1p s\u1ed1: 20 chia cho 1\/2 = 40 + 5 = 45<\/p>\n<h3><a id=\"post-25532-CAU_5_36\"><\/a>C\u00c2U 5:<\/h3>\n<p>B\u00e0i gi\u1ea3i: v\u00ec th\u00e1ng n\u00e0o c\u0169ng c\u00f3 ng\u00e0y th\u1ee9 28 n\u00ean \u0111\u00e1p \u00e1n l\u00e0:<\/p>\n<p>To\u00e0n b\u1ed9 12 th\u00e1ng trong n\u0103m, th\u00e1ng n\u00e0o c\u0169ng c\u00f3 28 ng\u00e0y.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00c2U 1: A logic v\u1edbi B. V\u1eady C ph\u1ea3i logic v\u1edbi nh\u00f3m n\u00e0o trong s\u1ed1 c\u00e1c nh\u00f3m 1, 2, 3, 4? C\u00c2U 2: C\u00f3 2 ng\u00f4i l\u00e0ng c\u00e1ch nhau 1 c\u00e2y c\u1ea7u. Ai mu\u1ed1n \u0111i t\u1eeb l\u00e0ng n\u00e0y sang l\u00e0ng kia ph\u1ea3i \u0111i qua c\u00e2y c\u1ea7u \u0111\u00f3 v\u00e0 c\u00f3 1 con qu\u1ef7 \u1edf gi\u1eefa c\u1ea7u, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[47],"tags":[],"class_list":["post-25532","post","type-post","status-publish","format-standard","hentry","category-do-vui"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25532","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=25532"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25532\/revisions"}],"predecessor-version":[{"id":25534,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25532\/revisions\/25534"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=25532"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=25532"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=25532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}