{"common":{"save":0,"post_id":"4540","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6856","post_id":"4540","mon_id":"1158113","chapter_id":"1158128","question":"<p>Tính t\u1ed5ng <strong>S<\/strong> các ph\u1ea7n t\u1eed c\u1ee7a t\u1eadp h\u1ee3p sau:<\/p><p><strong>M = { x ∈ Z | -40 < x < 41 }<\/strong>.<\/p><p><strong>T\u1ed5ng S = <\/strong><input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/><\/p>","options":"","correct":["[\"40\"]"],"level":"3","hint":"<p>Tách riêng 40, các s\u1ed1 khác 0 còn l\u1ea1i c\u1ee7a t\u1eadp h\u1ee3p M chia thành t\u1eebng c\u1eb7p s\u1ed1 \u0111\u1ed1i nhau có t\u1ed5ng b\u1eb1ng 0.<\/p>","answer":"<p>Vì M = { x ∈ Z | -40 < x < 41 } nên M = { -39 ; -38 ; ... -1 ; 0 ; 1 ; ... ; 38 ; 39 ; 40 }<\/p><p>Suy ra S = (-39) + (-38) + ... + (-1) + 0 + 1 + ... + 38 + 39 + 40<\/p><p> S = [(-39) + 39] + [(-38) + 38] + ... + [(-1) + 1] + 0 + 40<\/p><p> S = 0 + 0 + ... + 0 + 0 + 40<\/p><p> S = <span style=\"color:#16a085;\"><strong>40<\/strong><\/span><\/p><p>S\u1ed1 c\u1ea7n \u0111i\u1ec1n là <strong><span style=\"color:#16a085;\">40<\/span><\/strong><\/p>","type":"blank","extra_type":"","time":"0","user_id":"132","test":"3","date":"2021-08-29 14:04:47"},{"id":"6857","post_id":"4540","mon_id":"1158113","chapter_id":"1158128","question":"<p>Tính m\u1ed9t cách h\u1ee3p lí<\/p><p>A = 164 - (77 - 66) + (-23)<\/p><p><strong>A =<\/strong> <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/><\/p>","options":"","correct":["[\"130\"]"],"level":"3","hint":"<p>Khi b\u1ecf ngo\u1eb7c ta ph\u1ea3i <strong>gi\u1eef nguyên d\u1ea5u<\/strong> các s\u1ed1 trong ngo\u1eb7c n\u1ebfu tr\u01b0\u1edbc ngo\u1eb7c là <strong>d\u1ea5u c\u1ed9ng<\/strong> và <strong>\u0111\u1ed5i d\u1ea5u<\/strong> các s\u1ed1 trong ngo\u1eb7c n\u1ebfu tr\u01b0\u1edbc ngo\u1eb7c là <strong>d\u1ea5u tr\u1eeb.<\/strong><\/p><p>Chú ý. Khi thay \u0111\u1ed5i v\u1ecb trí c\u1ee7a các s\u1ed1 h\u1ea1ng ph\u1ea3i gi\u1eef nguyên d\u1ea5u c\u1ee7a chúng. Khi \u0111\u01b0a các s\u1ed1 vào ngo\u1eb7c mà tr\u01b0\u1edbc ngo\u1eb7c có d\u1ea5u tr\u1eeb ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u các s\u1ed1 \u0111ó.<\/p>","answer":"<p>A = 164 - (77 - 66) + (-23)<\/p><p>A = 164 - 77 + 66 - 23<\/p><p>A = 164 + 66 - 77 - 23<\/p><p>A = (164 + 66) - (77 + 23)<\/p><p>A = 230 - 100<\/p><p><strong><span style=\"color:#16a085;\">A = 130<\/span><\/strong><\/p><p>S\u1ed1 c\u1ea7n \u0111i\u1ec1n là <strong><span style=\"color:#16a085;\">130<\/span><\/strong><\/p>","type":"blank","extra_type":"","time":"0","user_id":"132","test":"3","date":"2021-08-29 14:10:39"},{"id":"6859","post_id":"4540","mon_id":"1158113","chapter_id":"1158128","question":"<p>Tính m\u1ed9t cách h\u1ee3p lí<\/p><p>127 + 121 + 115 - 124 - 118 - 112 + 1001<\/p>","options":["1001","0","1010"],"correct":"3","level":"3","hint":"<p>Khi b\u1ecf ngo\u1eb7c ta ph\u1ea3i <strong>gi\u1eef nguyên d\u1ea5u<\/strong> các s\u1ed1 trong ngo\u1eb7c n\u1ebfu tr\u01b0\u1edbc ngo\u1eb7c là <strong>d\u1ea5u c\u1ed9ng<\/strong> và <strong>\u0111\u1ed5i d\u1ea5u<\/strong> các s\u1ed1 trong ngo\u1eb7c n\u1ebfu tr\u01b0\u1edbc ngo\u1eb7c là <strong>d\u1ea5u tr\u1eeb.<\/strong><\/p><p>Chú ý. Khi thay \u0111\u1ed5i v\u1ecb trí c\u1ee7a các s\u1ed1 h\u1ea1ng ph\u1ea3i gi\u1eef nguyên d\u1ea5u c\u1ee7a chúng. Khi \u0111\u01b0a các s\u1ed1 vào ngo\u1eb7c mà tr\u01b0\u1edbc ngo\u1eb7c có d\u1ea5u tr\u1eeb ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u các s\u1ed1 \u0111ó.<\/p>","answer":"<p> 127 + 121 + 115 - 124 - 118 - 112 + 1001<\/p><p>= 127 - 124 + 121 - 118 + 115 - 112 + 1001<\/p><p>= (127 - 124) + (121 - 118) + (115 - 112) + 1001<\/p><p>= 3 + 3 + 3 + 1001<\/p><p>= 9 + 1001<\/p><p>=<strong> <span style=\"color:#16a085;\">1010<\/span><\/strong><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong> 1010<\/strong><\/span><\/p>","type":"choose","extra_type":"shape2","time":"0","user_id":"132","test":"3","date":"2021-08-29 14:17:04","option_type":"txt","len":0}]}