{"id":25539,"date":"2021-12-24T17:14:06","date_gmt":"2021-12-24T10:14:06","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=25539"},"modified":"2021-12-24T17:14:07","modified_gmt":"2021-12-24T10:14:07","slug":"bai-so-20-do-vui-luyen-tri-thong-minh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/bai-so-20-do-vui-luyen-tri-thong-minh\/","title":{"rendered":"B\u00c0I S\u1ed0 20 – \u0110\u1ed1 vui luy\u1ec7n tr\u00ed th\u00f4ng minh"},"content":{"rendered":"

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

V\u01b0\u1eddn tr\u01b0\u1eddng c\u00f3 tr\u1ed3ng 12 c\u00e2y t\u1ea1o th\u00e0nh 6 h\u00e0ng nh\u01b0 h\u00ecnh d\u01b0\u1edbi. B\u1ea1n c\u00f3 th\u1ec3 \u0111\u00e1nh s\u1ed1 t\u1eeb 1 \u0111\u1ebfn 12 cho t\u1eebng c\u00e2y sao cho t\u1ed5ng 4 s\u1ed1 \u1edf 4 c\u00e2y c\u00f9ng m\u1ed9t h\u00e0ng \u0111\u00fang b\u1eb1ng 26 \u0111\u01b0\u1ee3c kh\u00f4ng?<\/p>\n

\"38.jpg\"<\/p>\n

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

M\u1ed9t \u0111\u1ed1ng chu\u1ed9t ch\u00f9 \u0111i qua 1 c\u00e1i c\u1ea7u, 1 con r\u1edbt xu\u1ed1ng h\u1ecfi c\u00f2n bao nhi\u00eau con?<\/p>\n

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

M\u1ed9t \u0111\u00e0n nai h\u0103m h\u1edf \u0111i v\u00e0o r\u1eebng, b\u1ecb m\u1ed9t \u00f4ng th\u1ee3 s\u0103n b\u1eafn ch\u1ebft 1 con h\u1ecfi c\u00f2n bao nhi\u00eau con?<\/p>\n

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

Ng\u00e0y 30 – 4 tr\u01b0\u1eddng b\u1ea1n T\u00e8o \u0111\u00e3 m\u1eafc b\u00f3ng \u0111\u00e8n m\u00e0u xung quanh m\u1ed9t khung kh\u1ea9u hi\u1ec7u d\u00e0i 3m, r\u1ed9ng 1m. C\u1ee9 c\u00e1ch 50cm th\u00ec m\u1eafc m\u1ed9t b\u00f3ng \u0111\u00e8n. M\u1ed7i b\u00f3ng \u0111\u00e8n gi\u00e1 1.800\u0111\u1ed3ng. H\u1ecfi tr\u01b0\u1eddng h\u1ecdc n\u1ecd \u0111\u00e3 ph\u1ea3i mua h\u1ebft bao nhi\u00eau ti\u1ec1n b\u00f3ng \u0111\u00e8n m\u00e0u?<\/p>\n

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

H\u00e3y \u0111i\u1ec1n s\u1ed1 trong d\u00e3y s\u1ed1 ti\u1ebfp theo? (to\u00e1n m\u1eb9o)<\/p>\n

0 7 4 1 8?<\/p>\n

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

<\/a>B\u00c0I S\u1ed0 20<\/h2>\n

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

C\u00f3 r\u1ea5t nhi\u1ec1u c\u00e1ch \u0111\u00e1nh s\u1ed1 cho c\u00e2y. xin gi\u1edbi thi\u1ec7u v\u1edbi c\u00e1c b\u1ea1n hai c\u00e1ch sau:<\/p>\n

\"138.jpg\"<\/p>\n

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

\u0110\u00e2y l\u00e0 m\u1ed9t b\u00e0i to\u00e1n m\u1eb9o<\/p>\n

\u201c1 \u0111\u1ed1ng chu\u1ed9t ch\u00f9\u201d n\u00f3i l\u00e1i th\u00e0nh 1 ch\u00fa chu\u1ed9t \u0111\u1ed3ng, r\u1edbt xu\u1ed1ng 1 con. V\u1eady kh\u00f4ng c\u00f2n con n\u00e0o h\u1ebft!<\/p>\n

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

\u0110\u00e2y l\u00e0 m\u1ed9t b\u00e0i to\u00e1n m\u1eb9o<\/p>\n

M\u1ed9t \u0111\u00e0n nai h\u0103m, nai h\u0103m n\u00f3i l\u00e1i th\u00e0nh n\u0103m hai<\/p>\n

\u0110\u00e0n nai 52 con b\u1ecb \u00f4ng th\u1ee3 s\u0103n b\u1eafn ch\u1ebft 1 con c\u00f2n 51 con.<\/p>\n

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

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

Chu vi kh\u1ea9u hi\u1ec7u l\u00e0:<\/p>\n

(3 + 1) x 2 = 8 (m)<\/p>\n

Ta c\u00f3: 50 cm = 0,5m<\/p>\n

S\u1ed1 b\u00f3ng \u0111\u00e8n l\u00e0:<\/p>\n

8 : 0,5 = 16 (b\u00f3ng \u0111\u00e8n)<\/p>\n

S\u1ed1 ti\u1ec1n mua b\u00f3ng \u0111\u00e8n l\u00e0:<\/p>\n

16 x 1800 = 28800 (\u0111)<\/p>\n

\u0110\u00e1p s\u1ed1: 28800 \u0111\u1ed3ng<\/p>\n

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

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

7 x 0 = 0 => 0<\/p>\n

7 x 1 = 7 => 7<\/p>\n

7 x 2 = 14 => 4<\/p>\n

7 x 3 = 21 => 1<\/p>\n

7 x 4 = 28 => 8<\/p>\n

7 x 5 = 35 => 5<\/p>\n

V\u1eady s\u1ed1 ti\u1ebfp theo l\u00e0 s\u1ed1 5.<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00c2U 1: V\u01b0\u1eddn tr\u01b0\u1eddng c\u00f3 tr\u1ed3ng 12 c\u00e2y t\u1ea1o th\u00e0nh 6 h\u00e0ng nh\u01b0 h\u00ecnh d\u01b0\u1edbi. B\u1ea1n c\u00f3 th\u1ec3 \u0111\u00e1nh s\u1ed1 t\u1eeb 1 \u0111\u1ebfn 12 cho t\u1eebng c\u00e2y sao cho t\u1ed5ng 4 s\u1ed1 \u1edf 4 c\u00e2y c\u00f9ng m\u1ed9t h\u00e0ng \u0111\u00fang b\u1eb1ng 26 \u0111\u01b0\u1ee3c kh\u00f4ng? C\u00c2U 2: M\u1ed9t \u0111\u1ed1ng chu\u1ed9t ch\u00f9 \u0111i qua 1 c\u00e1i c\u1ea7u, 1 […]<\/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-25539","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\/25539","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=25539"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25539\/revisions"}],"predecessor-version":[{"id":25542,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25539\/revisions\/25542"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=25539"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=25539"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=25539"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}