{"id":25614,"date":"2021-12-24T17:30:29","date_gmt":"2021-12-24T10:30:29","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=25614"},"modified":"2021-12-24T17:31:48","modified_gmt":"2021-12-24T10:31:48","slug":"bai-so-34-do-vui-luyen-tri-thong-minh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/bai-so-34-do-vui-luyen-tri-thong-minh\/","title":{"rendered":"B\u00c0I S\u1ed0 34 &#8211; \u0110\u1ed1 vui luy\u1ec7n tr\u00ed th\u00f4ng minh"},"content":{"rendered":"<h3><a id=\"post-25614-CAU_1_33\"><\/a>C\u00c2U 1:<\/h3>\n<p>H\u00ecnh c\u1ee7a s\u1ed1 6 s\u1ebd \u0111\u01b0\u1ee3c v\u1ebd nh\u01b0 th\u1ebf n\u00e0o? \u0111\u1ed1 b\u1ea1n \u0111\u1ea5y!<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" width=\"449\" height=\"224\" class=\"wp-image-25615\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/69-jpg.jpeg\" alt=\"69.jpg\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/69-jpg.jpeg 449w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/69-jpg-300x150.jpeg 300w\" sizes=\"(max-width: 449px) 100vw, 449px\" \/><\/p>\n<h3><a id=\"post-25614-CAU_2_32\"><\/a>C\u00c2U 2:<\/h3>\n<p>C\u00f3 m\u1ed9t c\u00f4 b\u00e9 c\u00f3 2 chai n\u01b0\u1edbc, chai 5 l\u00edt v\u00e0 chai 3 l\u00edt, c\u00f4 c\u1ea7n l\u1ea5y 7 l\u00edt n\u01b0\u1edbc, h\u1ecfi l\u00e0m sao c\u00f4 b\u00e9 l\u1ea5y \u0111\u01b0\u1ee3c 7 l\u00edt?<\/p>\n<h3><a id=\"post-25614-CAU_3_33\"><\/a>C\u00c2U 3:<\/h3>\n<p>Nh\u00e2n ng\u00e0y 20\/11, 2 <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> t\u1edbi th\u0103m nh\u00e0 th\u1ea7y gi\u00e1o. H\u1ecdc tr\u00f2 h\u1ecfi th\u1ea7y: \u201cD\u1ea1 th\u01b0a th\u1ea7y, n\u0103m nay th\u1ea7y bao nhi\u00eau tu\u1ed5i r\u1ed3i \u1ea1?\u201d<\/p>\n<p>Th\u1ea7y gi\u00e1o \u0111\u00e3 tr\u1ea3 l\u1eddi nh\u01b0 sau: Ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb c\u1ee7a tu\u1ed5i th\u1ea7y n\u0103m nay v\u1eeba b\u1eb1ng tu\u1ed5i con trai th\u1ea7y; ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c l\u1ea1i v\u1eeba b\u1eb1ng tu\u1ed5i con g\u00e1i th\u1ea7y. \u0111\u1ed3ng th\u1eddi tu\u1ed5i c\u1ee7a th\u1ea7y l\u1ea1i g\u1ea5p 2 l\u1ea7n T\u00edch s\u1ed1 tu\u1ed5i c\u1ee7a con trai v\u00e0 con g\u00e1i. H\u1ecfi th\u1ea7y n\u0103m nay bao nhi\u00eau tu\u1ed5i?<\/p>\n<h3><a id=\"post-25614-CAU_4_29\"><\/a>C\u00c2U 4:<\/h3>\n<p>A B C<\/p>\n<p>F E D<\/p>\n<p>C\u00f3 5 tr\u00e1i b\u00f3ng n\u1eb1m \u1edf c\u00e1c v\u1ecb tr\u00ed: A, C, D, E, F nh\u01b0 s\u01a1 \u0111\u1ed3 tr\u00ean (ri\u00eang v\u1ecb tr\u00ed B kh\u00f4ng c\u00f3 tr\u00e1i b\u00f3ng n\u00e0o). B\u1ea1n h\u00e3y \u0111\u1ed5i ch\u1ed7 cho t\u1ea5t c\u1ea3 c\u00e1c tr\u00e1i b\u00f3ng tr\u00ean. Bi\u1ebft 2 tr\u00e1i b\u00f3ng kh\u00f4ng th\u1ec3 n\u1eb1m trong c\u00f9ng 1 v\u1ecb tr\u00ed.<\/p>\n<p>(g\u1ecdi tr\u00e1i b\u00f3ng n\u1eb1m \u1edf v\u1ecb tr\u00ed A l\u00e0 b\u00f3ng 1, v\u1ecb tr\u00ed B l\u00e0 b\u00f3ng 2&#8230;).<\/p>\n<h3><a id=\"post-25614-CAU_5_20\"><\/a>C\u00c2U 5:<\/h3>\n<p>B\u1ea1n h\u00e3y \u0111i\u1ec1n t\u1eeb 1 \u0111\u1ebfn 9 (m\u1ed7i s\u1ed1 1 l\u1ea7n) sao cho t\u1ed5ng c\u00e1c s\u1ed1 trong \u0111\u01b0\u1eddng d\u1ecdc, \u0111\u01b0\u1eddng ngang v\u00e0 \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng 15:<\/p>\n<p><img decoding=\"async\" width=\"193\" height=\"128\" class=\"wp-image-25616\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/71_1-jpg.jpeg\" alt=\"71_1.jpg\" \/><\/p>\n<h3><a id=\"post-25614-CAU_6_7\"><\/a>C\u00c2U 6:<\/h3>\n<p>M\u1ed9t \u0111\u00e0n g\u00e0 m\u00e0 b\u01b0\u01a1i trong b\u1ebfp, con s\u00f3i b\u1eaft m\u1ea5t ba con. H\u1ecfi c\u00f2n m\u1ea5y con g\u00e0 trong b\u1ebfp?<\/p>\n<h3><a id=\"post-25614-CAU_7_1\"><\/a>C\u00c2U 7:<\/h3>\n<p>T\u00ecm 1 s\u1ed1 t\u1ef1 nhi\u00ean, bi\u1ebft r\u1eb1ng t\u1ed5ng c\u1ee7a n\u00f3 v\u00e0 c\u00e1c ch\u1eef s\u1ed1 c\u1ee7a n\u00f3 b\u1eb1ng 2359?<\/p>\n<h1>H\u01af\u1edaNG D\u1eaaN &#8211; B\u00c0I GI\u1ea2I &#8211; \u0110\u00c1P S\u1ed0<\/h1>\n<h2><a id=\"post-25614-BAI_SO_34_1\"><\/a>B\u00c0I S\u1ed0 34<\/h2>\n<h3><a id=\"post-25614-CAU_1_72\"><\/a>C\u00c2U 1:<\/h3>\n<p><img decoding=\"async\" width=\"635\" height=\"420\" class=\"wp-image-25617\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/168-jpg.jpeg\" alt=\"168.jpg\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/168-jpg.jpeg 635w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/168-jpg-300x198.jpeg 300w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><\/p>\n<h3><a id=\"post-25614-CAU_2_72\"><\/a>C\u00c2U 2:<\/h3>\n<p>B\u00e0i gi\u1ea3i:<\/p>\n<p>C\u00e1ch l\u1ea5y 7 l\u00edt n\u01b0\u1edbc:<\/p>\n<p>\u0110\u1ed5 \u0111\u1ea7y n\u01b0\u1edbc v\u00e0o chai 5 l\u00edt, r\u1ed3i \u0111\u1ed5 t\u1eeb chai 5 l\u00edt qua chai 3 l\u00edt, ta c\u00f2n 2 l\u00edt d\u01b0 \u1edf chai 5 l\u00edt.<\/p>\n<p>\u0110\u1ed5 chai 3 l\u00edt \u0111i, l\u1ea5y ch\u1ed7 chuy\u1ec3n 2 l\u00edt c\u00f2n l\u1ea1i t\u1eeb chai 5 l\u00edt sang.<\/p>\n<p>\u0110\u1ed5 \u0111\u1ea7y chai 5 l\u00edt.<\/p>\n<p>V\u1eady t\u1ea5t c\u1ea3 ta c\u00f3: 5 + 2 = 7 l\u00edt.<\/p>\n<h3><a id=\"post-25614-CAU_3_73\"><\/a>C\u00c2U 3:<\/h3>\n<p>\u0110\u00e1p s\u1ed1: Th\u1ea7y 36 tu\u1ed5i.<\/p>\n<h3><a id=\"post-25614-CAU_4_67\"><\/a>C\u00c2U 4:<\/h3>\n<p>\u0110\u00e1p s\u1ed1: 1, 2, 3, 4, 5, 6 l\u00e0 c\u00e1c v\u1ecb tr\u00ed, v\u1ecb tr\u00ed th\u1ee9 2 kh\u00f4ng c\u00f3 b\u00f3ng. C\u00f3 c\u00e1c c\u00e1ch s\u1eafp x\u1ebfp sau:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"409\" height=\"245\" class=\"wp-image-25618\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/169-jpg.png\" alt=\"169.jpg\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/169-jpg.png 409w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/169-jpg-300x180.png 300w\" sizes=\"(max-width: 409px) 100vw, 409px\" \/><\/p>\n<h3><a id=\"post-25614-CAU_5_47\"><\/a>C\u00c2U 5:<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"289\" height=\"234\" class=\"wp-image-25619\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/170-jpg.jpeg\" alt=\"170.jpg\" \/><\/p>\n<p>\u0110\u00e1p s\u1ed1:<\/p>\n<p>T\u1ed5ng c\u00e1c s\u1ed1 \u1edf h\u00e0ng ngang<\/p>\n<p>4 + 9 + 2 = 15<\/p>\n<p>3 + 5 + 7 = 15<\/p>\n<p>8 + 1 + 6 = 15<\/p>\n<p>T\u1ed5ng c\u00e1c s\u1ed1 \u1edf h\u00e0ng ch\u00e9o<\/p>\n<p>4 + 5 + 6 = 15<\/p>\n<p>8 + 5 + 2 = 15<\/p>\n<p>T\u1ed5ng c\u00e1c s\u1ed1 \u1edf h\u00e0ng d\u1ecdc<\/p>\n<p>9 + 5 + 1 = 15<\/p>\n<p>2 + 7 + 6 = 15<\/p>\n<p>4 + 3 + 8 = 15<\/p>\n<h3><a id=\"post-25614-CAU_6_21\"><\/a>C\u00c2U 6:<\/h3>\n<p>\u0110\u00e1p s\u1ed1:<\/p>\n<p>C\u00f2n 10 con: \u201cm\u00e0 b\u01b0\u01a1i\u201d n\u00f3i l\u00e1i th\u00e0nh m\u01b0\u1eddi ba<\/p>\n<p>\u0110\u00e0n g\u00e0 b\u1ecb b\u1eaft m\u1ea5t 3 con n\u00ean s\u1ed1 g\u00e0 c\u00f2n l\u1ea1i l\u00e0:<\/p>\n<p>13 \u2013 3 = 10 (con).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00c2U 1: H\u00ecnh c\u1ee7a s\u1ed1 6 s\u1ebd \u0111\u01b0\u1ee3c v\u1ebd nh\u01b0 th\u1ebf n\u00e0o? \u0111\u1ed1 b\u1ea1n \u0111\u1ea5y! C\u00c2U 2: C\u00f3 m\u1ed9t c\u00f4 b\u00e9 c\u00f3 2 chai n\u01b0\u1edbc, chai 5 l\u00edt v\u00e0 chai 3 l\u00edt, c\u00f4 c\u1ea7n l\u1ea5y 7 l\u00edt n\u01b0\u1edbc, h\u1ecfi l\u00e0m sao c\u00f4 b\u00e9 l\u1ea5y \u0111\u01b0\u1ee3c 7 l\u00edt? C\u00c2U 3: Nh\u00e2n ng\u00e0y 20\/11, 2 h\u1ecdc sinh [&hellip;]<\/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-25614","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\/25614","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=25614"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25614\/revisions"}],"predecessor-version":[{"id":25620,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/25614\/revisions\/25620"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=25614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=25614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=25614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}