{"id":25564,"date":"2021-12-24T17:20:06","date_gmt":"2021-12-24T10:20:06","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=25564"},"modified":"2021-12-24T17:20:08","modified_gmt":"2021-12-24T10:20:08","slug":"bai-so-25-do-vui-luyen-tri-thong-minh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/bai-so-25-do-vui-luyen-tri-thong-minh\/","title":{"rendered":"B\u00c0I S\u1ed0 25 – \u0110\u1ed1 vui luy\u1ec7n tr\u00ed th\u00f4ng minh"},"content":{"rendered":"

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

B\u1ea1n h\u00e3y \u0111i\u1ec1n h\u00ecnh v\u1ebd th\u00edch h\u1ee3p v\u00e0o d\u1ea5u (?):<\/p>\n

\"49.jpg\"<\/p>\n

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

Ch\u1ecdn h\u00ecnh kh\u00e1c nh\u1ea5t trong c\u00e1c h\u00ecnh A, B, C, D, E<\/p>\n

\"50.jpg\"<\/p>\n

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

Ng\u00e0y ch\u1ee7 nh\u1eadt, hai b\u1ea1n T\u00ed v\u00e0 T\u00e8o r\u1ee7 nhau \u0111i c\u00e2u c\u00e1. Hai b\u1ea1n mang v\u1ec1 24 con c\u00e1. T\u00ed th\u00ec mu\u1ed1n c\u1eaft l\u00eca \u0111\u1ea7u c\u00e1 c\u00f2n T\u00e8o th\u00ec mu\u1ed1n c\u1eaft l\u00eca \u0111u\u00f4i c\u00e1. Hai b\u1ea1n c\u00f9ng ng\u1ed3i c\u1eaft… Qu\u00e1 m\u1ec7t hai b\u1ea1n c\u00f9ng ng\u1ed3i ngh\u1ec9 v\u00e0 nh\u1eadn ra r\u1eb1ng 3\/8 s\u1ed1 c\u00e1 \u0111\u00e3 c\u1eaft \u0111u\u00f4i v\u00e0 5 con c\u00e1 \u0111\u00e3 c\u1eaft \u0111\u1ea7u v\u00e0 \u0111u\u00f4i.<\/p>\n

\u0110\u1ed1 c\u00e1c b\u1ea1n bi\u1ebft c\u00f3 bao nhi\u00eau con c\u00e1 ch\u01b0a c\u1eaft \u0111\u1ea7u v\u00e0 \u0111u\u00f4i?<\/p>\n

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

Ai th\u00f4ng minh k\u1ec3 nhanh ra 5 ng\u00e0y trong tu\u1ea7n, tr\u1eeb th\u1ee9 hai, ba, t\u01b0!<\/p>\n

<\/a>C\u00c2U 5:<\/h3>\n

C\u00f3 b\u1ed1n b\u1ea1n A, B, C, D g\u00f3p ti\u1ec1n \u0111i mua qu\u1ea3 b\u00f3ng \u0111\u00e1<\/p>\n

B\u1ea1n A b\u1ecf 1\/3 s\u1ed1 ti\u1ec1n qu\u1ea3 b\u00f3ng<\/p>\n

B\u1ea1n B b\u1ecf b\u1eb1ng 1\/3 s\u1ed1 ti\u1ec1n c\u1ee7a 3 b\u1ea1n A, C, D<\/p>\n

B\u1ea1n C b\u1ecf b\u1eb1ng 1\/5 s\u1ed1 ti\u1ec1n c\u1ee7a 3 b\u1ea1n A, B, D<\/p>\n

B\u1ea1n D b\u1ecf 15000 ng\u00e0n \u0111\u1ed3ng s\u1ed1 ti\u1ec1n qu\u1ea3 b\u00f3ng<\/p>\n

\u0110\u1ed1 c\u00e1c b\u1ea1n bi\u1ebft v\u1edbi d\u1eef ki\u1ec7n nh\u01b0 tr\u00ean th\u00ec qu\u1ea3 b\u00f3ng c\u00f3 gi\u00e1 ti\u1ec1n bao nhi\u00eau?<\/p>\n

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

<\/a>B\u00c0I S\u1ed0 25<\/h2>\n

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

Nh\u00ecn h\u00ecnh v\u1ebd ta th\u1ea5y: Khi ch\u1ed3ng hai h\u00ecnh li\u1ec1n nhau \u1edf d\u01b0\u1edbi th\u00ec \u0111\u01b0\u1ee3c h\u00ecnh \u1edf tr\u00ean n\u00ean h\u00ecnh v\u1ebd th\u00edch h\u1ee3p \u0111i\u1ec1n v\u00e0o d\u1ea5u (?) l\u00e0 h\u00ecnh B.<\/p>\n

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

T\u1ed5ng c\u00e1c s\u1ed1 ch\u1ea5m tr\u00f2n v\u00e0 \u00f4 vu\u00f4ng trong m\u1ed7i h\u00ecnh \u0111\u1ec1u b\u1eb1ng 6. Ri\u00eang h\u00ecnh B c\u00f3 t\u1ed5ng c\u00e1c ch\u1ea5m tr\u00f2n v\u00e0 \u00f4 vu\u00f4ng l\u00e0 5. V\u1eady h\u00ecnh kh\u00e1c nh\u1ea5t trong c\u00e1c h\u00ecnh \u0111\u00f3 l\u00e0 h\u00ecnh B.<\/p>\n

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

S\u1ed1 c\u00e1 b\u1ecb T\u00e8o c\u1eaft \u0111u\u00f4i l\u00e0 : \"150-1.jpg\"<\/p>\n

24 x 3\/8 =9 (con c\u00e1)<\/p>\n

\"150.jpg\"<\/p>\n

Ta v\u1ebd s\u01a1 \u0111\u1ed3 bi\u1ec3u th\u1ecb c\u00e1c ph\u1ea7n nh\u01b0 h\u00ecnh v\u1ebd tr\u00ean.<\/p>\n

V\u00ec c\u00f3 5 con c\u00e1 b\u1ecb c\u1eaft \u0111\u1ea7u v\u00e0 \u0111u\u00f4i (ph\u1ea7n xanh l\u00e1 c\u00e2y) n\u00ean s\u1ed1 c\u00e1 ch\u1ec9 b\u1ecb c\u1eaft \u0111u\u00f4i (ph\u1ea7n xanh) l\u00e0:<\/p>\n

9 – 5 = 4 (con)<\/p>\n

G\u1ecdi s\u1ed1 c\u00e1 ch\u1ec9 b\u1ecb T\u00ed c\u1eaft \u0111\u1ea7u (ph\u1ea7n v\u00e0ng) l\u00e0 x th\u00ec s\u1ed1 c\u00e1 kh\u00f4ng b\u1ecb c\u1eaft \u0111\u1ea7u v\u00e0 \u0111u\u00f4i (ph\u1ea7n \u0111\u1ecf) l\u00e0: 24 – (9 + x) = 24 – 9 – x = 15 – x<\/p>\n

L\u1ea7n l\u01b0\u1ee3t cho x l\u00e0 c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean t\u1eeb 0 \u0111\u1ebfn 15 ta c\u00f3 16 k\u1ebft qu\u1ea3 t\u01b0\u01a1ng \u1ee9ng.<\/p>\n

\u0110\u00e1p s\u1ed1: 16 con<\/p>\n

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

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

H\u00f4m kia, h\u00f4m qua, h\u00f4m nay, ng\u00e0y mai, ng\u00e0y kia.<\/p>\n

<\/a>C\u00c2U 5:<\/h3>\n

\u0110\u00e1p \u00e1n: 60.000<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00c2U 1: B\u1ea1n h\u00e3y \u0111i\u1ec1n h\u00ecnh v\u1ebd th\u00edch h\u1ee3p v\u00e0o d\u1ea5u (?): C\u00c2U 2: Ch\u1ecdn h\u00ecnh kh\u00e1c nh\u1ea5t trong c\u00e1c h\u00ecnh A, B, C, D, E C\u00c2U 3: Ng\u00e0y ch\u1ee7 nh\u1eadt, hai b\u1ea1n T\u00ed v\u00e0 T\u00e8o r\u1ee7 nhau \u0111i c\u00e2u c\u00e1. Hai b\u1ea1n mang v\u1ec1 24 con c\u00e1. T\u00ed th\u00ec mu\u1ed1n c\u1eaft l\u00eca \u0111\u1ea7u c\u00e1 […]<\/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-25564","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\/25564","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=25564"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25564\/revisions"}],"predecessor-version":[{"id":25569,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25564\/revisions\/25569"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=25564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=25564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=25564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}