{"id":25500,"date":"2021-12-24T17:02:03","date_gmt":"2021-12-24T10:02:03","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=25500"},"modified":"2021-12-24T17:02:04","modified_gmt":"2021-12-24T10:02:04","slug":"bai-so-12-do-vui-luyen-tri-thong-minh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/bai-so-12-do-vui-luyen-tri-thong-minh\/","title":{"rendered":"B\u00c0I S\u1ed0 12 – \u0110\u1ed1 vui luy\u1ec7n tr\u00ed th\u00f4ng minh"},"content":{"rendered":"

<\/a>C\u00c2U 1:<\/h3>\n

C\u00f3 3 tam gi\u00e1c \u0111\u01b0\u1ee3c x\u1ebfp b\u1edfi 9 que di\u00eam nh\u01b0 sau:<\/p>\n

\/ \/ \/_<\/p>\n

H\u00e3y b\u1ecf \u0111i 2 que di\u00eam \u0111\u1ec3 kh\u00f4ng c\u00f2n tam gi\u00e1c n\u00e0o c\u1ea3?<\/p>\n

<\/a>C\u00c2U 2:<\/h3>\n

Nh\u00e0 Lan \u1edf trong m\u1ed9t khu chung c\u01b0 c\u00f3 8 t\u1ea7ng, m\u1ed7i t\u1ea7ng c\u00f3 8 c\u0103n h\u1ed9. Lan ch\u1ec9 c\u00f3 th\u1ec3 tr\u1ea3 l\u1eddi b\u1ea1n l\u00e0 “\u0111\u00fang” ho\u1eb7c “kh\u00f4ng”. B\u1eb1ng s\u1ed1 c\u00e2u h\u1ecfi \u00edt nh\u1ea5t h\u00e3y t\u00ecm ra s\u1ed1 nh\u00e0 Lan.<\/p>\n

<\/a>C\u00c2U 3:<\/h3>\n

\u0110\u1ed1 c\u00e1c b\u1ea1n 3 c\u00e1i c\u1ea7u v\u1ed3ng c\u00f3 bao nhi\u00eau m\u00e0u?<\/p>\n

<\/a>C\u00c2U 4:<\/h3>\n

Tu\u1ed5i h\u1ed3ng nay \u0111\u00fang 15<\/p>\n

H\u1ed3ng th\u00ec h\u01a1n Th\u1eafm y 5 tu\u1ed5i m\u00e0<\/p>\n

Tu\u1ed5i c\u00f4 so Th\u1eafm g\u1ea5p ba<\/p>\n

C\u00f4 bao nhi\u00eau tu\u1ed5i g\u1ea7n xa T\u00ednh li\u1ec1n?<\/p>\n

H\u01af\u1edaNG D\u1eaaN – B\u00c0I GI\u1ea2I – \u0110\u00c1P S\u1ed0<\/h1>\n

<\/a>B\u00c0I S\u1ed0 12<\/h2>\n

<\/a>C\u00c2U 1:<\/h3>\n

B\u1ecf 2 c\u1ea1nh b\u00ean c\u1ee7a tam gi\u00e1c \u1edf gi\u1eefa, ta \u0111\u01b0\u1ee3c: tam gi\u00e1c – tam gi\u00e1c = 0<\/p>\n

=> \/ \/_ = 0<\/p>\n

<\/a>C\u00c2U 2:<\/h3>\n

Khu chung c\u01b0 c\u00f3 8 t\u1ea7ng m\u1ed7i t\u1ea7ng c\u00f3 8 ph\u00f2ng t\u1ed5ng c\u1ed9ng l\u00e0 c\u00f3 64 ph\u00f2ng t\u1ea5t c\u1ea3.<\/p>\n

Tr\u01b0\u1edbc ti\u00ean t\u00f4i h\u1ecfi “s\u1ed1 nh\u00e0 c\u1ee7a b\u1ea1n l\u1edbn h\u01a1n 32 ph\u1ea3i kh\u00f4ng”. gi\u1ea3 s\u1eed Lan s\u1ebd tr\u1ea3 l\u1eddi l\u00e0 “kh\u00f4ng” th\u00ec t\u1ee9c l\u00e0 s\u1ed1 nh\u00e0 Lan ph\u1ea3i nh\u1ecf h\u01a1n 32. Ta ti\u1ebfp t\u1ee5c h\u1ecfi “s\u1ed1 nh\u00e0 c\u1ee7a b\u1ea1n l\u1edbn h\u01a1n 16 ph\u1ea3i kh\u00f4ng”. N\u1ebfu Lan tr\u1ea3 l\u1eddi “kh\u00f4ng” th\u00ec ta l\u1ea1i ti\u1ebfp t\u1ee5c h\u1ecfi “s\u1ed1 nh\u00e0 c\u1ee7a b\u1ea1n nh\u1ecf h\u01a1n 8 ph\u1ea3i kh\u00f4ng”… V\u00e0 c\u1ee9 th\u1ebf ta s\u1ebd t\u00ecm ra \u0111\u01b0\u1ee3c s\u1ed1 nh\u00e0 c\u1ee7a Lan sau 6 l\u1ea7n h\u1ecfi b\u1eb1ng c\u00e1ch chia \u0111\u00f4i.<\/p>\n

<\/a>C\u00c2U 3:<\/h3>\n

M\u1ed9t c\u00e1i th\u00ec c\u00f3 7 m\u00e0u, ba c\u00e1i c\u0169ng 7 m\u00e0u th\u00f4i.<\/p>\n

<\/a>C\u00c2U 4:<\/h3>\n

B\u00e0i gi\u1ea3i:<\/p>\n

Tu\u1ed5i th\u1eafm l\u00e0:<\/p>\n

15 \u2013 5 = 10 (tu\u1ed5i)<\/p>\n

Tu\u1ed5i C\u00f4 l\u00e0:<\/p>\n

10 x 3 = 30 (tu\u1ed5i)<\/p>\n

\u0110\u00e1p s\u1ed1: 30 tu\u1ed5i.<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00c2U 1: C\u00f3 3 tam gi\u00e1c \u0111\u01b0\u1ee3c x\u1ebfp b\u1edfi 9 que di\u00eam nh\u01b0 sau: \/ \/ \/_ H\u00e3y b\u1ecf \u0111i 2 que di\u00eam \u0111\u1ec3 kh\u00f4ng c\u00f2n tam gi\u00e1c n\u00e0o c\u1ea3? C\u00c2U 2: Nh\u00e0 Lan \u1edf trong m\u1ed9t khu chung c\u01b0 c\u00f3 8 t\u1ea7ng, m\u1ed7i t\u1ea7ng c\u00f3 8 c\u0103n h\u1ed9. Lan ch\u1ec9 c\u00f3 th\u1ec3 tr\u1ea3 l\u1eddi […]<\/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-25500","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\/25500","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=25500"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25500\/revisions"}],"predecessor-version":[{"id":25501,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25500\/revisions\/25501"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=25500"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=25500"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=25500"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}