{"common":{"save":0,"post_id":"4780","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8052","post_id":"4780","mon_id":"1158113","chapter_id":"1158128","question":"<p>T\u1eadp h\u1ee3p t\u1ea5t c\u1ea3 các \u01b0\u1edbc chung c\u1ee7a 12 và -9 có bao nhiêu ph\u1ea7n t\u1eed?<\/p><p>Có <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/> ph\u1ea7n t\u1eed<\/p>","options":"","correct":["[\"4\"]"],"level":"3","hint":"<p>Tìm t\u1ea5t c\u1ea3 các \u01b0\u1edbc c\u1ee7a 12 và tìm t\u1ea5t c\u1ea3 các \u01b0\u1edbc c\u1ee7a -9. Sau \u0111ó ch\u1ecdn ra nh\u1eefng s\u1ed1 gi\u1ed1ng nhau, các s\u1ed1 \u0111ó chính là \u01b0\u1edbc chung c\u1ee7a 12 và -9.<\/p><p>\u0110\u1ebfm xem có bao nhiêu s\u1ed1 là \u01b0\u1edbc chung c\u1ee7a 12 và -9.<\/p>","answer":"<p>Các \u01b0\u1edbc c\u1ee7a 12 g\u1ed3m -12; -6; -4; -3; -2; -1; 1; 2; 3; 4; 6; 12<\/p><p>Các \u01b0\u1edbc c\u1ee7a -9 g\u1ed3m -9; -3; -1; 1; 3; 9<\/p><p>Do \u0111ó các \u01b0\u1edbc chung c\u1ee7a 12 và -9 g\u1ed3m -3; -1; 1; 3 (ch\u1ecdn ra các s\u1ed1 gi\u1ed1ng nhau).<\/p><p>Suy ra t\u1eadp h\u1ee3p các \u01b0\u1edbc chung c\u1ee7a 12 và -9 <strong>có 4 ph\u1ea7n t\u1eed<\/strong>.<\/p><p>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n là <span style=\"color:#16a085;\"><strong>4<\/strong><\/span>.<\/p>","type":"blank","extra_type":"","time":"0","user_id":"132","test":"1","date":"2021-10-02 13:04:03"},{"id":"8054","post_id":"4780","mon_id":"1158113","chapter_id":"1158128","question":"<p>Tìm x, bi\u1ebft:<\/p><p>(-35) . x + 27 . 3 = -200 + 2021<span class=\"math-tex\">$^0$<\/span><\/p>","options":["x = -8","x = 18","x = 8"],"correct":"3","level":"3","hint":"","answer":"<p>(-35) . x + 27 . 3 = -200 + 2021<span class=\"math-tex\">$^0$<\/span><\/p><p>(-35) . x + 81 = -200 + 1<\/p><p>(-35) . x + 81 = -199<\/p><p>(-35) . x = -199 - 81<\/p><p>(-35) . x = -280<\/p><p> x = (-280) : (-35)<\/p><p> x = 8<\/p><p>V\u1eady \u0111áp án \u0111úng là <span style=\"color:#16a085;\"><strong>x = 8<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"1","date":"2021-10-02 13:09:54","option_type":"txt","len":0},{"id":"8059","post_id":"4780","mon_id":"1158113","chapter_id":"1158128","question":"<p>T\u1eadp h\u1ee3p sau có bao nhiêu ph\u1ea7n t\u1eed?<\/p><p>M={ x∈Z | 150 \u22ee x ; 240 \u22ee x }<\/p>","options":["15 ","8","16"],"correct":"3","level":"3","hint":"<p>Tìm \u01b0\u1edbc chung l\u1edbn nh\u1ea5t c\u1ee7a 150 và 240.<\/p><p>Sau \u0111ó tìm t\u1ea5t c\u1ea3 các \u01b0\u1edbc c\u1ee7a \u01afCLN. <\/p>","answer":"<p>Ta có: \u01afCLN(150, 240) = 30 <\/p><p>Do \u0111ó \u01b0\u1edbc chung c\u1ee7a 150 và 240 chính là các \u01b0\u1edbc c\u1ee7a 30.<\/p><p>T\u1ea5t c\u1ea3 các \u01b0\u1edbc c\u1ee7a 30 g\u1ed3m ±1; ±2; ±3; ±5; ±6; ±10; ±15; ±30<\/p><p>Suy t\u1eadp M g\u1ed3m các \u01b0\u1edbc chung c\u1ee7a 150 và 240 là M = { <span style=\"color:#9b59b6;\">±1; ±2; ±3; ±5; ±6; ±10; ±15; <span style=\"color:#8e44ad;\">±30<\/span><\/span> }<\/p><p>M có 16 ph\u1ea7n t\u1eed.<\/p><p>V\u1eady \u0111áp án \u0111úng là <span style=\"color:#16a085;\"><strong>16<\/strong><\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"1","date":"2021-10-02 13:27:37","option_type":"txt","len":0}]}
