{"id":25627,"date":"2021-12-24T17:32:09","date_gmt":"2021-12-24T10:32:09","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=25627"},"modified":"2021-12-24T17:32:10","modified_gmt":"2021-12-24T10:32:10","slug":"bai-so-35-do-vui-luyen-tri-thong-minh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/bai-so-35-do-vui-luyen-tri-thong-minh\/","title":{"rendered":"B\u00c0I S\u1ed0 35 – \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\n\n\n\n\n
5<\/td>\n4<\/td>\n6<\/td>\n2<\/td>\n4<\/td>\n1<\/td>\n7<\/td>\n8<\/td>\n7<\/td>\n<\/tr>\n
6<\/td>\n6<\/td>\n4<\/td>\n2<\/td>\n2<\/td>\n7<\/td>\n8<\/td>\n?<\/td>\n1<\/td>\n<\/tr>\n
5<\/td>\n2<\/td>\n7<\/td>\n1<\/td>\n2<\/td>\n7<\/td>\n6<\/td>\n5<\/td>\n4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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

C\u00f3 m\u1ed9t m\u1ea3nh v\u01b0\u1eddn, 2\/4 di\u1ec7n t\u00edch d\u00f9ng \u0111\u1ec3 tr\u1ed3ng hoa, 1\/5 di\u1ec7n t\u00edch d\u00f9ng \u0111\u1ec3 l\u00e0m \u0111\u01b0\u1eddng \u0111i, 2\/10 di\u1ec7n t\u00edch d\u00f9ng \u0111\u1ec3 tr\u1ed3ng c\u1ecf, di\u1ec7n t\u00edch c\u00f2n l\u1ea1i d\u00f9ng l\u00e0m b\u1ec3 n\u01b0\u1edbc. H\u1ecfi di\u1ec7n t\u00edch b\u1ec3 n\u01b0\u1edbc l\u00e0 bao nhi\u00eau?<\/p>\n

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

T\u00ecm s\u1ed1 ti\u1ebfp theo c\u1ee7a d\u00e3y s\u1ed1: 1; 2; 2\/3; 1\/3; 2\/7;…?<\/p>\n

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

M\u1ed9t ng\u01b0\u1eddi \u0111\u00e0n \u00f4ng v\u00e0 m\u1ed9t ng\u01b0\u1eddi \u0111\u00e0n b\u00e0 n\u00f3i chuy\u1ec7n v\u1edbi nhau trong m\u1ed9t l\u1ec5 h\u1ed9i h\u00f3a trang:<\/p>\n

“T\u00f4i th\u1eadt ra l\u00e0 \u0111\u00e0n b\u00e0” – ng\u01b0\u1eddi h\u00f3a trang th\u00e0nh m\u1ed9t ho\u00e0ng t\u1eed n\u00f3i v\u1eady.<\/p>\n

“T\u00f4i th\u1eadt ra l\u00e0 \u0111\u00e0n \u00f4ng” – ng\u01b0\u1eddi ho\u00e1 trang th\u00e0nh n\u00e0ng ti\u00ean n\u00f3i v\u1eady. N\u1ebfu nh\u01b0 c\u00f3 \u00edt nh\u1ea5t m\u1ed9t ng\u01b0\u1eddi n\u00f3i d\u1ed1i th\u00ec ai l\u00e0 \u0111\u00e0n \u00f4ng, ai l\u00e0 \u0111\u00e0n b\u00e0? Em h\u00e3y gi\u1ea3i th\u00edch nh\u00e9!<\/p>\n

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

B\u1ea1n h\u00e3y th\u1eed v\u00ed m\u00ecnh nh\u01b0 m\u1ed9t ch\u00e0ng hi\u1ec7p s\u0129 can \u0111\u1ea3m v\u00ec mu\u1ed1n gi\u1ea3i c\u1ee9u m\u1ed9t c\u00f4 c\u00f4ng ch\u00faa xinh \u0111\u1eb9p tuy\u1ec7t tr\u1ea7n m\u00e0 ph\u1ea3i chi\u1ebfn \u0111\u1ea5u v\u1edbi m\u1ed9t con r\u1ed3ng l\u1eeda c\u00f3 1000 c\u00e1i \u0111\u1ea7u. V\u1edbi m\u1ed9t chi\u00eau b\u1ea1n c\u00f3 th\u1ec3 ch\u1eb7t 1, 17, 21 ho\u1eb7c 33 c\u00e1i \u0111\u1ea7u c\u1ee7a con r\u1ed3ng \u0111\u00f3 nh\u01b0ng sau khi ch\u1eb7t th\u00ec t\u1eeb c\u00e1i \u0111\u1ea7u b\u1ecb ch\u1eb7t s\u1ebd m\u1ecdc ra 10, 14, 0 hay 40 c\u00e1i \u0111\u1ea7u kh\u00e1c n\u1eefa (t\u00f9y theo s\u1ed1 \u0111\u1ea7u m\u00e0 b\u1ea1n ch\u1eb7t: 1 – 10; 17 – 14; 21 – 0; 33 – 40). N\u1ebfu nh\u01b0 b\u1ea1n ch\u1eb7t \u0111\u1ee9t c\u00e1i \u0111\u1ea7u cu\u1ed1i c\u00f9ng c\u1ee7a n\u00f3 th\u00ec m\u1edbi h\u1ea1 \u0111\u01b0\u1ee3c n\u00f3 v\u00e0 l\u00fac \u0111\u00f3 b\u1ea1n c\u00f3 th\u1ec3 c\u1ee9u \u0111\u01b0\u1ee3c c\u00f4 c\u00f4ng ch\u00faa di\u1ec5m l\u1ec7.<\/p>\n

B\u1ea1n s\u1ebd ch\u1eb7t nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ec3 h\u1ea1 \u0111\u01b0\u1ee3c con r\u1ed3ng l\u1eeda \u0111\u00e1ng gh\u00e9t \u0111\u00f3?<\/p>\n

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

M\u1ed9t ng\u00e0y kim gi\u1edd v\u00e0 kim ph\u00fat vu\u00f4ng g\u00f3c v\u1edbi nhau bao nhi\u00eau l\u1ea7n, kim ph\u00fat v\u00e0 kim gi\u00e2y vu\u00f4ng g\u00f3c nhau bao nhi\u00eau l\u1ea7n?<\/p>\n

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

<\/a>B\u00c0I S\u1ed0 35<\/h2>\n

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

\u0110\u00f3 l\u00e0 s\u1ed1 9<\/p>\n

546 + 241 = 787<\/p>\n

664 + 227 = 891<\/p>\n

527 + 127 = 654<\/p>\n

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

\u0110\u00e1p \u00e1n: Di\u1ec7n t\u00edch d\u00f9ng l\u00e0m b\u1ec3 n\u01b0\u1edbc:<\/p>\n

1- 2 – 1 – 2 = 1 – 10 – 4 – 4 = 2 = 1 (di\u1ec7n t\u00edch v\u01b0\u1eddn)<\/p>\n

\u0110\u00e1p s\u1ed1: 1 (di\u1ec7n t\u00edch v\u01b0\u1eddn)<\/p>\n

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

\u0110\u00e1p s\u1ed1: S\u1ed1 ti\u1ebfp theo c\u1ee7a d\u00e3y s\u1ed1 l\u00e0: 2<\/p>\n

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

C\u1ea3 2 ng\u01b0\u1eddi c\u00f9ng n\u00f3i d\u1ed1i<\/p>\n

=> ng\u01b0\u1eddi h\u00f3a trang th\u00e0nh 1 ho\u00e0ng t\u1eed l\u00e0 \u0111\u00e0n \u00f4ng, ng\u01b0\u1eddi ho\u00e1 trang th\u00e0nh m\u1ed9t n\u00e0ng ti\u00ean l\u00e0 \u0111\u00e0n b\u00e0.<\/p>\n

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

C\u00f3 2 c\u00e1ch:<\/p>\n

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

\u0110\u1ea7u ti\u00ean ch\u00e9m 47 l\u1ea7n, m\u1ed7i l\u1ea7n ch\u00e9m 21 \u0111\u1ea7u (v\u1eady l\u00e0 \u0111\u00e3 ch\u1eb7t \u0111\u01b0\u1ee3c: 47 x 21 = 987 \u0111\u1ea7u c\u1ee7a con r\u1ed3ng) ,c\u00f2n l\u1ea1i 13 \u0111\u1ea7u ch\u00e9m 1 c\u00e1i, => m\u1ecdc l\u00ean 10 c\u00e1i \u0111\u1ea7u => s\u1ed1 \u0111\u1ea7u l\u00fac n\u00e0y l\u00e0 22 \u0111\u1ea7u, ch\u00e9m 21 \u0111\u1ea7u, sau \u0111\u00f3 ch\u00e9m n\u1ed1t 1 \u0111\u1ea7u c\u00f2n l\u1ea1i.<\/p>\n

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

\u0110\u1ea7u ti\u00ean ch\u00e9m 46 l\u1ea7n, m\u1ed7i l\u1ea7n ch\u1eb7t 21 c\u00e1i \u0111\u1ea7u c\u1ee7a con r\u1ed3ng (t\u1ee9c l\u00e0 \u0111\u00e3 ch\u1eb7t 46 x 21 = 966 c\u00e1i). C\u00f2n l\u1ea1i 34 c\u00e1i. Sau \u0111\u00f3 ch\u1eb7t 1 l\u1ea7n 33 c\u00e1i, c\u00f2n 1 c\u00e1i. N\u00f3 m\u1ecdc th\u00eam 40 c\u00e1i n\u1eefa, s\u1ed1 \u0111\u1ea7u l\u00fac n\u00e0y l\u00e0 41 c\u00e1i. Ch\u1eb7t 17 c\u00e1i, n\u00f3 c\u00f2n 24 c\u00e1i \u0111\u1ea7u, m\u1ecdc th\u00eam 14 c\u00e1i \u0111\u1ea7u n\u1eefa, cho t\u1edbi l\u00fac n\u00e0y s\u1ed1 \u0111\u1ea7u l\u00e0 38 c\u00e1i. L\u1ea7n ti\u1ebfp theo ch\u1eb7t 21 c\u00e1i th\u00ec c\u00f2n 17 c\u00e1i \u0111\u1ea7u. V\u00e0 b\u1ea1n ch\u1eb7t 1 l\u1ea7n n\u1eefa l\u00e0 \u0111\u00e3 c\u1ee9u \u0111\u01b0\u1ee3c c\u00f4ng ch\u00faa r\u1ed3i.<\/p>\n

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

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

a\/ M\u1ed7i ng\u00e0y c\u00f3 24h n\u00ean kim gi\u1edd v\u00e0 kim ph\u00fat vu\u00f4ng g\u00f3c v\u1edbi nhau \u0111\u00fang 48 l\u1ea7n.<\/p>\n

b\/ M\u1ed9t ng\u00e0y c\u00f3 24 x 60 ph\u00fat n\u00ean kim ph\u00fat v\u00e0 kim gi\u00e2y vu\u00f4ng g\u00f3c v\u1edbi nhau 48 x 60 = 2 880 (l\u1ea7n).<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00c2U 1: S\u1ed1 n\u00e0o s\u1ebd thay cho d\u1ea5u (?): 5 4 6 2 4 1 7 8 7 6 6 4 2 2 7 8 ? 1 5 2 7 1 2 7 6 5 4 C\u00c2U 2: C\u00f3 m\u1ed9t m\u1ea3nh v\u01b0\u1eddn, 2\/4 di\u1ec7n t\u00edch d\u00f9ng \u0111\u1ec3 tr\u1ed3ng hoa, 1\/5 di\u1ec7n t\u00edch d\u00f9ng \u0111\u1ec3 l\u00e0m […]<\/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-25627","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\/25627","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=25627"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25627\/revisions"}],"predecessor-version":[{"id":25628,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25627\/revisions\/25628"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=25627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=25627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=25627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}