{"id":25570,"date":"2021-12-24T17:21:33","date_gmt":"2021-12-24T10:21:33","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=25570"},"modified":"2021-12-24T17:21:33","modified_gmt":"2021-12-24T10:21:33","slug":"bai-so-26-do-vui-luyen-tri-thong-minh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/bai-so-26-do-vui-luyen-tri-thong-minh\/","title":{"rendered":"B\u00c0I S\u1ed0 26 – \u0110\u1ed1 vui luy\u1ec7n tr\u00ed th\u00f4ng minh"},"content":{"rendered":"

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

T\u00ed \u0111\u1ed1 T\u1eb9o c\u1eaft t\u1ea5m b\u00eca h\u00ecnh A (g\u1ed3m ba \u00f4 vu\u00f4ng) th\u00e0nh 2 ph\u1ea7n r\u1ed3i gh\u00e9p l\u1ea1i th\u00e0nh h\u00ecnh B. T\u1eb9o loay hoay m\u00e3i m\u00e0 ch\u01b0a l\u00e0m \u0111\u01b0\u1ee3c. C\u00f2n c\u00e1c b\u1ea1n, c\u00e1c b\u1ea1n s\u1ebd c\u1eaft, gh\u00e9p th\u1ebf n\u00e0o?<\/p>\n

\"51.jpg\"<\/p>\n

<\/a>C\u00c2U 2: (\u0110\u1ed0 M\u1eb8O)<\/h3>\n

Tr\u00ean \u0111\u1ed3ng c\u1ecf c\u00f3 6 con b\u00f2, \u0111\u1ebfm \u0111i \u0111\u1ebfm l\u1ea1i ch\u1ec9 c\u00f3 12 c\u00e1i ch\u00e2n. H\u1ecfi t\u1ea1i sao?<\/p>\n

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

B\u00e1c n\u0103m c\u00f3 10 v\u00ed \u0111\u1ef1ng ti\u1ec1n, trong m\u1ed7i v\u00ed \u0111\u1ef1ng 10 \u0111\u1ed3ng ti\u1ec1n gi\u1ed1ng h\u1ec7t nhau. C\u00f3 1 v\u00ed \u0111\u1ef1ng to\u00e0n ti\u1ec1n gi\u1ea3. C\u00e1c \u0111\u1ed3ng ti\u1ec1n th\u1eadt n\u1eb7ng 10g, c\u00f2n c\u00e1c \u0111\u1ed3ng ti\u1ec1n gi\u1ea3 n\u1eb7ng h\u01a1n \u0111\u00fang 1g.<\/p>\n

V\u1edbi m\u1ed9t l\u1ea7n c\u00e2n, c\u00f3 qu\u1ea3 c\u00e2n, b\u1eb1ng c\u00e1ch n\u00e0o c\u00f3 th\u1ec3 ch\u1ec9 ra v\u00ed \u0111\u1ef1ng ti\u1ec1n gi\u1ea3?.<\/p>\n

Ch\u00fa \u00fd: C\u00e2n \u0111\u00fang 1 l\u1ea7n c\u00e2n duy nh\u1ea5t v\u00e0 c\u00f3 qu\u1ea3 c\u00e2n (t\u1ee9c l\u00e0 t\u00ednh \u0111\u01b0\u1ee3c g l\u00e0 bao nhi\u00eau).<\/p>\n

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

Hai ng\u01b0\u1eddi: m\u1ed9t l\u1edbn, m\u1ed9t b\u00e9 \u0111i l\u00ean \u0111\u1ec9nh m\u1ed9t qu\u1ea3 n\u00fai. Ng\u01b0\u1eddi b\u00e9 l\u00e0 con c\u1ee7a ng\u01b0\u1eddi l\u1edbn, nh\u01b0ng ng\u01b0\u1eddi l\u1edbn l\u1ea1i kh\u00f4ng ph\u1ea3i cha c\u1ee7a ng\u01b0\u1eddi b\u00e9, h\u1ecfi ng\u01b0\u1eddi l\u1edbn l\u00e0 ai?<\/p>\n

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

C\u1ea7n ph\u1ea3i s\u1eafp 10 con s\u1ed1 “2” th\u1ebf n\u00e0o \u0111\u1ec3 n\u1ebfu \u0111em t\u1ed5ng s\u1ed1 c\u1ee7a ch\u00fang chia cho 2 s\u1ebd \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0 1234?<\/p>\n

<\/a>C\u00c2U 6:<\/h3>\n

B\u00e9, T\u00e8o, T\u00fd, T\u1ebbo, Teo c\u00f9ng nhau \u0111i thi.<\/p>\n

Teo kh\u00f4ng ph\u1ea3i l\u00e0 ng\u01b0\u1eddi \u0111\u1ee9ng cu\u1ed1i.<\/p>\n

T\u1ebbo kh\u00f4ng ph\u1ea3i \u0111\u1ee9ng \u0111\u1ea7u hay cu\u1ed1i.<\/p>\n

Teo cao \u0111i\u1ec3m h\u01a1n T\u00e8o. T\u1ebbo cao \u0111i\u1ec3m h\u01a1n T\u00fd.<\/p>\n

B\u00e9, \u0111i\u1ec3m th\u1ea5p h\u01a1n T\u00e8o nh\u01b0ng cao h\u01a1n T\u1ebbo.<\/p>\n

Ai \u0111i\u1ec3m cao nh\u1ea5t? Theo th\u1ee9 t\u1ef1.<\/p>\n

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

<\/a>B\u00c0I S\u1ed0 26<\/h2>\n

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

Chia t\u1ea5m b\u00eca c\u1ee7a T\u00ed th\u00e0nh 12 \u00f4 vu\u00f4ng b\u1eb1ng nhau, ta s\u1ebd ph\u00e1t hi\u1ec7n c\u00f3 r\u1ea5t nhi\u1ec1u c\u00e1ch c\u1eaft gh\u00e9p \u0111\u1ea5y. D\u01b0\u1edbi \u0111\u00e2y m\u1ed9t s\u1ed1 c\u00e1ch c\u1eaft gh\u00e9p sau:<\/p>\n

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

\"151.jpg\"<\/p>\n

\u0110\u00e1p \u00e1n (gi\u1ea3i m\u1eb9o):<\/p>\n

6 con b\u00f2 = 3 con b\u00f2 x 3 con b\u00f2 \u2013 3 con b\u00f2 = ba (c\u1ee7a) con b\u00f2 x ba (c\u1ee7a) con b\u00f2 – ba (c\u1ee7a) con b\u00f2<\/p>\n

=> S\u1ed1 ch\u00e2n s\u1ebd l\u00e0: 4 x 4 – 4 = 12 (ch\u00e2n).<\/p>\n

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

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

C\u00e1ch 1:<\/p>\n

Ta \u0111\u00e1nh s\u1ed1 th\u1ee9 t\u1ef1 cho 10 v\u00ed \u0111\u00f3 t\u1eeb 0 \u0111\u1ebfn 9, sau \u0111\u00f3 l\u1ea5y t\u1eeb trong v\u00ed ra t\u1eebng \u0111\u1ed3ng ti\u1ec1n \u1ee9ng v\u1edbi s\u1ed1 tr\u00ean v\u00ed (ngh\u0129a l\u00e0 v\u00ed s\u1ed1 6 th\u00ec l\u1ea5y ra 6 \u0111\u1ed3ng, c\u00f2n v\u00ed s\u1ed1 0 th\u00ec kh\u00f4ng c\u1ea7n l\u1ea5y).<\/p>\n

Nh\u01b0 v\u1eady t\u1ed5ng c\u1ed9ng ta l\u1ea5y 45 \u0111\u1ed3ng ti\u1ec1n (45 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9)<\/p>\n

\u0110em c\u00e2n 45 \u0111\u1ed3ng n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c m\u1ed9t con s\u1ed1, l\u1ea5y con s\u1ed1 n\u00e0y tr\u1eeb cho 450 (t\u1ed5ng s\u1ed1 g ch\u00ednh x\u00e1c) s\u1ebd ra 1 con s\u1ed1, s\u1ed1 \u0111\u00f3 ch\u00ednh l\u00e0 s\u1ed1 c\u1ee7a v\u00ed ti\u1ec1n gi\u1ea3.<\/p>\n

V\u1eady l\u00e0 ch\u1ec9 m\u1ed9t l\u1ea7n c\u00e2n ta \u0111\u00e3 ch\u1ec9 ra \u0111\u01b0\u1ee3c v\u00ed ti\u1ec1n gi\u1ea3.<\/p>\n

C\u00e1ch 2:<\/p>\n

\u0110\u00e1nh d\u1ea5u t\u1eeb 1\u2260 10<\/p>\n

L\u1ea5y b\u1ecbch 1 ra 1 \u0111\u1ed3ng, b\u1ecbch 2 l\u1ea5y 2 \u0111\u1ed3ng c\u1ee9 th\u1ebf b\u1ecbch 10 l\u1ea5y 10 \u0111\u1ed3ng… V\u00ec 1 v\u00ed 10 \u0111\u1ed3ng \u2260 10 v\u00ed l\u00e0 100 \u0111\u1ed3ng \u2260 100g.<\/p>\n

Gi\u1edd \u0111em c\u00e2n c\u00e1c v\u00ed. N\u1ebfu ch\u1ec9 c\u00f3 99g th\u00ec v\u00ed 1 l\u00e0 ti\u1ec1n gi\u1ea3 (v\u00ec nh\u1eb9 h\u01a1n 1g do thi\u1ebfu 1 \u0111\u1ed3ng, n\u1ebfu 98g th\u00ec v\u00ed 2 l\u00e0 ti\u1ec1n gi\u1ea3 do thi\u1ebfu 2 \u0111\u1ed3ng, c\u1ee9 th\u1ebf l\u00e0 ra).<\/p>\n

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

\u0110\u00e1p S\u1ed1: M\u1eb9.<\/p>\n

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

\u0110\u00e1p s\u1ed1 ch\u00ednh l\u00e0: (2 + 22 + 222 + 2222) : 2= 1234<\/p>\n

<\/a>C\u00c2U 6:<\/h3>\n

\u0110\u00e1p \u00e1n: Th\u1ee9 t\u1ef1: Teo, T\u00e8o, B\u00e9, T\u1ebbo, T\u00fd<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00c2U 1: T\u00ed \u0111\u1ed1 T\u1eb9o c\u1eaft t\u1ea5m b\u00eca h\u00ecnh A (g\u1ed3m ba \u00f4 vu\u00f4ng) th\u00e0nh 2 ph\u1ea7n r\u1ed3i gh\u00e9p l\u1ea1i th\u00e0nh h\u00ecnh B. T\u1eb9o loay hoay m\u00e3i m\u00e0 ch\u01b0a l\u00e0m \u0111\u01b0\u1ee3c. C\u00f2n c\u00e1c b\u1ea1n, c\u00e1c b\u1ea1n s\u1ebd c\u1eaft, gh\u00e9p th\u1ebf n\u00e0o? C\u00c2U 2: (\u0110\u1ed0 M\u1eb8O) Tr\u00ean \u0111\u1ed3ng c\u1ecf c\u00f3 6 con b\u00f2, \u0111\u1ebfm \u0111i \u0111\u1ebfm […]<\/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-25570","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\/25570","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=25570"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25570\/revisions"}],"predecessor-version":[{"id":25573,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25570\/revisions\/25573"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=25570"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=25570"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=25570"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}