Toán lớp 6 - Sách kết nối tri thức - Đề kiểm tra 15 phút - Toán lớp 6 - Tháng 12 - Số 2
{"save":1,"level":1,"time":"15","total":10,"point":5,"segment":[{"id":"2066","test_id":"364","question":"<p>Tính giá tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c:<\/p><p>P = 2021 . ( -1990 - 72) + (-2021) . ( 28 - 1990)<\/p>","options":["P = 202100","P = -2021","P = -202100"],"correct":"3","answer":"<p>P = 2021 . ( -1990 - 72) + (-2021) . ( 28 - 1990)<\/p><p> = 2021 . (-1990) - 2021 . 72 - 2021 . 28 + (-2021). (-1990)<\/p><p> = [ -2021. 1990 + 2021 . 1990 ] - [ 2021 . 72 + 2021 . 28 ]<\/p><p> = 1990 . (2021 - 2021) - 2021 . (72 + 28)<\/p><p> = 1990 . 0 - 2021 . 100<\/p><p> = 0 - 202100<\/p><p> = -202100<\/p><p>V\u1eady \u0111áp án \u0111úng là <span style=\"color:#16a085;\"><strong>P = -202100<\/strong><\/span>.<\/p>","type":"choose","user_id":"132","test":"1","date":"2021-09-24 02:41:37"},{"id":"2067","test_id":"364","question":"<p>Li\u1ec7t kê các ph\u1ea7n t\u1eed c\u1ee7a t\u1eadp h\u1ee3p M g\u1ed3m các s\u1ed1 nguyên âm là \u01b0\u1edbc c\u1ee7a -14.<\/p>","options":["M = { 1; 2; 7; 14}","M = { -1; -2; -7; -14}","M = { <span class=\"math-tex\">$\\pm$<\/span>1; <span class=\"math-tex\">$\\pm$<\/span>2; <span class=\"math-tex\">$\\pm$<\/span>7; <span class=\"math-tex\">$\\pm$<\/span>14}","M = { 0; -1; -2; -7; -14}"],"correct":"2","answer":"<p>Ta có các \u01b0\u1edbc nguyên d\u01b0\u01a1ng c\u1ee7a 14 là: 1; 2; 7; 14.<\/p><p>Suy ra t\u1ea5t c\u1ea3 các \u01b0\u1edbc c\u1ee7a -14 là: <span class=\"math-tex\">$\\pm$<\/span>1; <span class=\"math-tex\">$\\pm$<\/span>2; <span class=\"math-tex\">$\\pm$<\/span>7; <span class=\"math-tex\">$\\pm$<\/span>14<\/p><p>Vì t\u1eadp h\u1ee3p M g\u1ed3m các s\u1ed1 nguyên âm là \u01b0\u1edbc c\u1ee7a -14 nên M = { -1; -2; -7; -14}<\/p><p>V\u1eady \u0111áp án \u0111úng là <span style=\"color:#16a085;\"><strong>M = { -1; -2; -7; -14}<\/strong><\/span>.<\/p>","type":"choose","user_id":"132","test":"1","date":"2021-09-24 02:47:44"}]}