{"common":{"save":0,"post_id":"6070","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5225","mon_id":"1158767","chapter_id":"1158770","post_id":"6070","question":"<p>T\u1eadp h\u1ee3p A = {0; 2; 3; 4} có bao nhiêu t\u1eadp h\u1ee3p con có \u0111úng hai ph\u1ea7n t\u1eed?<\/p>","options":["4","6","7","8"],"correct":"2","level":"3","hint":"<p>N\u1ebfu t\u1eadp h\u1ee3p X có <span style=\"color:#3498db;\">n ph\u1ea7n t\u1eed<\/span> thì s\u1ed1 t\u1eadp h\u1ee3p con c\u1ee7a X có \u0111úng hai ph\u1ea7n t\u1eed là <span style=\"color:#3498db;\"><span class=\"math-tex\">$\\dfrac{n.(n-1)}{2}$<\/span><\/span> (t\u1eadp)<\/p>","answer":"<p>T\u1eadp A = {0; 2; 4; 6} có <span style=\"color:#3498db;\">4<\/span> ph\u1ea7n t\u1eed.<\/p><p>S\u1ed1 t\u1eadp h\u1ee3p con có \u0111úng hai ph\u1ea7n t\u1eed c\u1ee7a A là: <span style=\"color:#3498db;\"><span class=\"math-tex\">$\\dfrac{4.(4-1)}{2}=6\\space$<\/span><\/span> (t\u1eadp)<\/p><p>\u0110áp án là <span style=\"color:#16a085;\"><strong>6<\/strong><\/span><\/p>","type":"choose","extra_type":"star","user_id":"131","test":"0","date":"2022-08-29 14:33:29","option_type":"txt","len":0},{"id":"5228","mon_id":"1158767","chapter_id":"1158770","post_id":"6070","question":"<p>Cho các t\u1eadp h\u1ee3p sau:<\/p><p><span style=\"color:#2980b9;\">M là t\u1eadp h\u1ee3p các hình vuông;<\/span><\/p><p><span style=\"color:#2980b9;\">N là t\u1eadp h\u1ee3p các hình ch\u1eef nh\u1eadt;<\/span><\/p><p><span style=\"color:#2980b9;\">P là t\u1eadp h\u1ee3p các hình bình hành.<\/span><\/p><p>Câu nào d\u01b0\u1edbi \u0111ây là \u0111úng?<\/p>","options":["<strong>1.<\/strong> M ⊂ N ⊂ P","<strong>2.<\/strong> M ⊂ P ⊂ N","<strong>3.<\/strong> N ⊂ M ⊂ P","<strong>4.<\/strong> P ⊂ N ⊂ M"],"correct":"1","level":"3","hint":"<p>M\u1ed7i hình vuông \u0111\u1ec1u là m\u1ed9t hình ch\u1eef nh\u1eadt.<\/p><p>M\u1ed7i hình ch\u1eef nh\u1eadt \u0111\u1ec1u là m\u1ed9t hình bình hành.<\/p>","answer":"<p>M\u1ed7i hình vuông \u0111\u1ec1u là m\u1ed9t hình ch\u1eef nh\u1eadt nên t\u1eadp M là con c\u1ee7a t\u1eadp N.<\/p><p>M\u1ed7i hình ch\u1eef nh\u1eadt \u0111\u1ec1u là m\u1ed9t hình bình hành nên t\u1eadp N là con c\u1ee7a t\u1eadp P.<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>1. <\/strong> M ⊂ N ⊂ P<\/span><span style=\"color:#16a085;\"><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2022-08-29 14:50:38","option_type":"txt","len":2},{"id":"5230","mon_id":"1158767","chapter_id":"1158770","post_id":"6070","question":"<p>Cho ba t\u1eadp h\u1ee3p A = {2; 5}, B = {5; x}, C = {x; y; 5}. Khi A = B = C thì<\/p>","options":["<strong>1.<\/strong> x = y = 2","<strong>2. <\/strong> x = y = 2 ho\u1eb7c x = 2, y = 5","<strong>3.<\/strong> x = 2, y = 5","<strong>4. <\/strong> x = 5, y = 2 ho\u1eb7c x = y = 5."],"correct":"2","level":"3","hint":"","answer":"<p>Bi\u1ebft A = {2; 5}; B = {5; x}. Vì A = B nên x = 2.<\/p><p>Vì A = C nên y = 2 ho\u1eb7c y = 5.<\/p><p>Do \u0111ó khi A = B = C thì x = y = 2 ho\u1eb7c x = 2, y = 5.<\/p><p>\u0110áp án là <span style=\"color:#16a085;\"><strong>2.<\/strong> x = y = 2 ho\u1eb7c x = 2, y = 5<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2022-08-29 14:58:56","option_type":"txt","len":2}]}
