{"id":25550,"date":"2021-12-24T17:16:46","date_gmt":"2021-12-24T10:16:46","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=25550"},"modified":"2021-12-24T17:16:47","modified_gmt":"2021-12-24T10:16:47","slug":"bai-so-22-do-vui-luyen-tri-thong-minh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/bai-so-22-do-vui-luyen-tri-thong-minh\/","title":{"rendered":"B\u00c0I S\u1ed0 22 – \u0110\u1ed1 vui luy\u1ec7n tr\u00ed th\u00f4ng minh"},"content":{"rendered":"

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

S\u1ed1 n\u00e0o s\u1ebd thay cho d\u1ea5u (?):<\/p>\n

\"42.jpg\"<\/p>\n

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

C\u00f4 b\u00e9 L\u1ecd Lem c\u00f3 3 mi\u1ebfng th\u1ecbt c\u1ea7n ph\u1ea3i r\u00e1n g\u1ea5p m\u00e0 c\u00f4 b\u00e9 ch\u1ec9 c\u00f3 6 ph\u00fat \u0111\u1ec3 r\u00e1n v\u1edbi 2 c\u00e1i ch\u1ea3o, m\u1ed7i l\u1ea7n ch\u1ec9 r\u00e1n \u0111\u01b0\u1ee3c 1 mi\u1ebfng trong khi \u0111\u00f3 mu\u1ed1n r\u00e1n xong 1 m\u1eb7t m\u1ea5t 2 ph\u00fat. Ai c\u00f3 th\u1ec3 r\u00e1n gi\u00fap c\u00f4 b\u00e9 L\u1ecd Lem?<\/p>\n

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

A b\u01a1i nhanh h\u01a1n B, nh\u01b0ng ch\u1eadm h\u01a1n C. D th\u01b0\u1eddng b\u01a1i nhanh h\u01a1n B, \u0111\u00f4i khi nhanh h\u01a1n A, nh\u01b0ng kh\u00f4ng bao gi\u1edd nhanh h\u01a1n C. V\u1eady, ai l\u00e0 ng\u01b0\u1eddi b\u01a1i nhanh nh\u1ea5t?<\/p>\n

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

T\u00ecm 1 s\u1ed1 c\u00f3 4 ch\u1eef s\u1ed1, bi\u1ebft r\u1eb1ng l\u1ea5y s\u1ed1 \u0111\u00f3 nh\u00e2n v\u1edbi 2 r\u1ed3i tr\u1eeb \u0111i 1004 th\u00ec k\u1ebft qu\u1ea3 nh\u1eadn \u0111\u01b0\u1ee3c l\u00e0 s\u1ed1 c\u00f3 4 ch\u1eef s\u1ed1 vi\u1ebft b\u1edfi c\u00e1c ch\u1eef s\u1ed1 nh\u01b0 ch\u1eef s\u1ed1 ban \u0111\u1ea7u nh\u01b0ng theo th\u1ee9 t\u1ef1 ng\u01b0\u1ee3c l\u1ea1i?<\/p>\n

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

<\/a>B\u00c0I S\u1ed0 22<\/h2>\n

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

\"144.jpg\"<\/p>\n

\u0110i\u1ec1n s\u1ed1 4 v\u00e0o d\u1ea5u ch\u1ea5m h\u1ecfi<\/p>\n

A + D = B + E + C<\/p>\n

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

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

Ba mi\u1ebfng th\u1ecbt c\u00f3 6 m\u1eb7t c\u1ea7n r\u00e1n! G\u1ecdi ch\u1ea3o 1 r\u00e1n mi\u1ebfng 1 v\u00e0 ch\u1ea3o 2 r\u00e1n mi\u1ebfng th\u1ee9 2<\/p>\n

L\u1ea7n 1: M\u1ea5t 2 ph\u00fat \u0111\u01b0\u1ee3c 2 m\u1eb7t c\u1ee7a 2 mi\u1ebfng th\u1ecbt.<\/p>\n

L\u1ea7n 2: Ta b\u1ecf mi\u1ebfng th\u1ee9 1 ra kh\u1ecfi ch\u1ea3o 1, thay v\u00e0o \u0111\u00f3 mi\u1ebfng 3. L\u1eadt m\u1eb7t mi\u1ebfng th\u1ecbt ch\u1ea3o th\u1ee9 2 m\u1ea5t th\u00eam 2 ph\u00fat ta \u0111\u01b0\u1ee3c 1 mi\u1ebfng r\u00e1n xong v\u00e0 2 mi\u1ebfng r\u00e1n \u0111\u01b0\u1ee3c 1 m\u1eb7t.<\/p>\n

L\u1ea7n 3: C\u1ee9 th\u1ebf b\u1ecf 2 m\u1eb7t ch\u01b0a r\u00e1n c\u00f2n l\u1ea1i v\u00e0o r\u00e1n.<\/p>\n

Xong! B\u00e2y gi\u1edd ta mang ra t\u1eb7ng c\u00f4 b\u00e9 L\u1ecd Lem th\u00f4i, m\u1ea5t \u0111\u00fang 6 ph\u00fat nh\u00e9!<\/p>\n

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

Ng\u01b0\u1eddi b\u01a1i nhanh nh\u1ea5t l\u00e0 C.<\/p>\n

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

\u0110\u00e1p s\u1ed1: 2003 x 2 – 1004 = 3002<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00c2U 1: S\u1ed1 n\u00e0o s\u1ebd thay cho d\u1ea5u (?): C\u00c2U 2: C\u00f4 b\u00e9 L\u1ecd Lem c\u00f3 3 mi\u1ebfng th\u1ecbt c\u1ea7n ph\u1ea3i r\u00e1n g\u1ea5p m\u00e0 c\u00f4 b\u00e9 ch\u1ec9 c\u00f3 6 ph\u00fat \u0111\u1ec3 r\u00e1n v\u1edbi 2 c\u00e1i ch\u1ea3o, m\u1ed7i l\u1ea7n ch\u1ec9 r\u00e1n \u0111\u01b0\u1ee3c 1 mi\u1ebfng trong khi \u0111\u00f3 mu\u1ed1n r\u00e1n xong 1 m\u1eb7t m\u1ea5t 2 ph\u00fat. Ai […]<\/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-25550","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\/25550","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=25550"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25550\/revisions"}],"predecessor-version":[{"id":25553,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25550\/revisions\/25553"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=25550"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=25550"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=25550"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}