{"id":25476,"date":"2021-12-24T16:53:51","date_gmt":"2021-12-24T09:53:51","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=25476"},"modified":"2021-12-24T16:53:52","modified_gmt":"2021-12-24T09:53:52","slug":"bai-so-7-do-vui-luyen-tri-thong-minh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/bai-so-7-do-vui-luyen-tri-thong-minh\/","title":{"rendered":"B\u00c0I S\u1ed0 7 – \u0110\u1ed1 vui luy\u1ec7n tr\u00ed th\u00f4ng minh"},"content":{"rendered":"

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

H\u00e3y \u0111i\u1ec1n v\u00e0o d\u1ea5u (?)!<\/p>\n\n\n\n\n\n\n
1000mm<\/td>\n18 gi\u1edd 10 ph\u00fat<\/td>\n<\/tr>\n
100cm<\/td>\n20 gi\u1edd 35 ph\u00fat<\/td>\n<\/tr>\n
10dm<\/td>\n23 gi\u1edd<\/td>\n<\/tr>\n
?<\/td>\n?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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

Ch\u1eb3ng c\u1ea7n l\u00e0m T\u00ednh \u0111\u00e2u nha<\/p>\n

Nhanh nhanh so s\u00e1nh A v\u00e0 B xem!<\/p>\n

\u0110\u1ed1 ai, \u0111\u1ed1 b\u1ea1n, \u0111\u1ed1 em<\/p>\n

Ai \u0111\u00e1p nhanh tr\u00fang, th\u01b0\u1edfng k\u00e8m ph\u00e1o tay.<\/p>\n

A = 575 \u2013 (307 \u2013 199)<\/p>\n

B = 575 \u2013 (307 + 199)<\/p>\n

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

D\u00f9ng \u00eake v\u00e0 th\u01b0\u1edbc c\u00f3 v\u1ea1ch chia \u0111\u1ec3 v\u1ebd c\u00e1c h\u00ecnh vu\u00f4ng c\u00f3 di\u1ec7n T\u00edch l\u00e0 1cm2, 4cm2, 9cm2 th\u00ec th\u1eadt \u0111\u01a1n gi\u1ea3n c\u00f3 ph\u1ea3i kh\u00f4ng c\u00e1c b\u1ea1n? Th\u1eadm ch\u00ed ta v\u1eabn c\u00f3 th\u1ec3 v\u1ebd \u0111\u01b0\u1ee3c h\u00ecnh vu\u00f4ng c\u00f3 di\u1ec7n T\u00edch l\u00e0 m\u1ed9t s\u1ed1 th\u1eadp ph\u00e2n, mi\u1ec5n sao T\u00ednh \u0111\u01b0\u1ee3c c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng \u0111\u00f3. Ch\u1eb3ng h\u1ea1n mu\u1ed1n v\u1ebd m\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 di\u1ec7n T\u00edch 17, 64cm2 ta ch\u1ec9 c\u1ea7n v\u1ebd m\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh 4,2cm b\u1edfi v\u00ec 4,2 x 4,2 = 17,64<\/p>\n

B\u00e2y gi\u1edd, v\u1ea5n \u0111\u1ec1 \u0111\u1eb7t ra l\u00e0: Ch\u1ec9 d\u00f9ng \u00eake v\u00e0 th\u01b0\u1edbc c\u00f3 v\u1ea1ch chia th\u00ec c\u00f3 th\u1ec3 v\u1ebd \u0111\u01b0\u1ee3c h\u00ecnh vu\u00f4ng m\u00e0 di\u1ec7n T\u00edch b\u1eb1ng 37 cm2 kh\u00f4ng?<\/p>\n

Xin ti\u1ebft l\u1ed9 tr\u01b0\u1edbc v\u1edbi c\u00e1c b\u1ea1n l\u00e0 c\u00f3 \u0111\u1ea5y, m\u00e0 c\u00f3 \u00edt nh\u1ea5t hai c\u00e1ch v\u1ebd c\u01a1!<\/p>\n

N\u00e0o! c\u00e1c b\u1ea1n h\u00e3y b\u1eaft tay ngay v\u00e0o c\u00f4ng vi\u1ec7c kh\u00f4ng \u00edt h\u00f3c b\u00faa n\u00e0y xem ai l\u00e0 ng\u01b0\u1eddi c\u00f3 ch\u1ec9 s\u1ed1 IQ cao nh\u1ea5t nh\u00e9!<\/p>\n

<\/a>C\u00c2U 4. (\u0110\u1ed1 m\u1eb9o):<\/h3>\n

C\u00f3 1 con chu\u1ed9t \u0111\u1ebfn nh\u00e0 1 con m\u00e8o th\u00e1ch \u0111\u1ed1 ch\u1ea1y \u0111ua xem ai nhanh h\u01a1n ai, bi\u1ebft r\u1eb1ng con chu\u1ed9t ch\u1ea1y nhanh h\u01a1n con m\u00e8o g\u1ea5p 2 l\u1ea7n nh\u01b0ng m\u00e8o l\u1ea1i dai s\u1ee9c h\u01a1n chu\u1ed9t g\u1ea5p 3 l\u1ea7n.<\/p>\n

B\u00e2y gi\u1edd c\u00e1c b\u1ea1n h\u00e3y \u0111o\u00e1n xem con n\u00e0o ch\u1ea1y nhanh h\u01a1n con n\u00e0o?<\/p>\n

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

\u1ede m\u1ed9t qu\u1ea7y b\u00e1n gia c\u1ea7m, c\u00f4 b\u00e1n h\u00e0ng cho gi\u00e1 nh\u01b0 sau: \u201cM\u1ed9t con g\u00e0 v\u00e0 ba con v\u1ecbt b\u1eb1ng gi\u00e1 hai con ngan; m\u1ed9t con v\u1ecbt, hai con g\u00e0 v\u00e0 ba con ngan t\u1ed5ng c\u1ed9ng l\u00e0 25 \u0111\u1ed3ng. M\u1ed7i con c\u00f3 gi\u00e1 m\u1ed9t s\u1ed1 nguy\u00ean \u0111\u1ed3ng\u201d. H\u1ecfi gi\u00e1 b\u00e1n m\u1ed7i con gia c\u1ea7m l\u00e0 bao nhi\u00eau?<\/p>\n

\"15.jpg\"<\/p>\n

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

<\/a>B\u00c0I S\u1ed0 7<\/h2>\n

<\/a>C\u00c2U 1:<\/h3>\n\n\n\n\n\n\n
1000mm<\/td>\n18 gi\u1edd 10 ph\u00fat<\/td>\n<\/tr>\n
100cm<\/td>\n20 gi\u1edd 35 ph\u00fat<\/td>\n<\/tr>\n
10dm<\/td>\n23 gi\u1edd<\/td>\n<\/tr>\n
1m<\/td>\n1 gi\u1edd 25 ph\u00fat<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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

B\u00e0i gi\u1ea3i:<\/p>\n\n\n\n\n\n\n
A<\/td>\n= 575<\/td>\n\u2013 (307 \u2013 199)<\/td>\n<\/tr>\n
Hi\u1ec7u<\/td>\nS\u1ed1 b\u1ecb tr\u1eeb<\/td>\nS\u1ed1 tr\u1eeb<\/td>\n<\/tr>\n
B<\/td>\n= 575<\/td>\n\u2013 (307 + 199)<\/td>\n<\/tr>\n
Hi\u1ec7u<\/td>\nS\u1ed1 b\u1ecb tr\u1eeb<\/td>\nS\u1ed1 tr\u1eeb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Ta th\u1ea5y:<\/p>\n

2 s\u1ed1 b\u1ecb tr\u1eeb b\u1eb1ng nhau l\u00e0 575<\/p>\n

So s\u00e1nh 2 s\u1ed1 tr\u1eeb:<\/p>\n

(307 \u2013 199) < (307 + 199) v\u1eady A > B.<\/p>\n

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

C\u00f3 \u00edt nh\u1ea5t hai c\u00e1ch v\u1ebd sau:<\/p>\n

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

V\u1ebd h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh 5cm, k\u00e9o d\u00e0i m\u1ed7i c\u1ea1nh v\u1ec1 ph\u00eda b\u00ean ph\u1ea3i c\u1ee7a c\u1ea1nh 1cm. N\u1ed1i c\u00e1c \u0111i\u1ec3m m\u00fat c\u1ee7a c\u00e1c c\u1ea1nh v\u1eeba k\u00e9o d\u00e0i ta \u0111\u01b0\u1ee3c h\u00ecnh vu\u00f4ng c\u00f3 di\u1ec7n t\u00edch 37cm2 (c\u00e1c b\u1ea1n t\u1ef1 ch\u1ee9ng minh).<\/p>\n

\"112.jpg\"<\/p>\n

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

V\u1ebd h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh 7cm. Tr\u00ean m\u1ed7i c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng, ta l\u1ea5y 1 \u0111i\u1ec3m c\u00e1ch \u0111\u1ec9nh b\u00ean ph\u1ea3i c\u1ee7a c\u1ea1nh 1cm. N\u1ed1i c\u00e1c \u0111i\u1ec3m \u0111\u00f3 l\u1ea1i, ta \u0111\u01b0\u1ee3c h\u00ecnh vu\u00f4ng c\u00f3 di\u1ec7n t\u00edch 37cm2. (c\u00e1c b\u1ea1n t\u1ef1 ch\u1ee9ng minh).<\/p>\n

\"113.jpg\"<\/p>\n

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

Kh\u00f4ng con n\u00e0o th\u1eafng h\u1ebft.<\/p>\n

N\u1ebfu chu\u1ed9t ch\u1ea1y \u0111\u1ebfn s\u1ebd b\u1ecb m\u00e8o \u0103n th\u1ecbt ngay!<\/p>\n

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

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

1 con g\u00e0: 4 \u0111\u1ed3ng
\n1 con v\u1ecbt: 2 \u0111\u1ed3ng
\n1 con ngan: 5 \u0111\u1ed3ng<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00c2U 1: H\u00e3y \u0111i\u1ec1n v\u00e0o d\u1ea5u (?)! 1000mm 18 gi\u1edd 10 ph\u00fat 100cm 20 gi\u1edd 35 ph\u00fat 10dm 23 gi\u1edd ? ? C\u00c2U 2: Ch\u1eb3ng c\u1ea7n l\u00e0m T\u00ednh \u0111\u00e2u nha Nhanh nhanh so s\u00e1nh A v\u00e0 B xem! \u0110\u1ed1 ai, \u0111\u1ed1 b\u1ea1n, \u0111\u1ed1 em Ai \u0111\u00e1p nhanh tr\u00fang, th\u01b0\u1edfng k\u00e8m ph\u00e1o tay. A = 575 […]<\/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-25476","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\/25476","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=25476"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25476\/revisions"}],"predecessor-version":[{"id":25480,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25476\/revisions\/25480"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=25476"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=25476"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=25476"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}