{"common":{"save":0,"post_id":"6705","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7263","mon_id":"1158767","chapter_id":"1158998","post_id":"6705","question":"<p>Cho t\u1eadp h\u1ee3p A = {2 ; 5 ; 6 ; 7 ; 8} và B = {1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7}. T\u1eadp A\\B có bao nhiêu ph\u1ea7n t\u1eed?<\/p>","options":["<strong>A.<\/strong> 8","<strong>B.<\/strong> 1","<strong>C.<\/strong> 0","<strong>D.<\/strong> 12"],"correct":"2","level":"1","hint":"","answer":"<p>A\\B = {8}.<\/p><p>V\u1eady t\u1eadp A\\B có 1 ph\u1ea7n t\u1eed.<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"> <strong>B.<\/strong> 1.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-09-20 01:55:34","option_type":"txt","len":0},{"id":"7265","mon_id":"1158767","chapter_id":"1158998","post_id":"6705","question":"<p> Cho hai t\u1eadp h\u1ee3p A = <span class=\"math-tex\">$\\{x \\in Z |-1\\le x \\le 3 \\}$<\/span> và B = <span class=\"math-tex\">$\\{ x \\in N |x \\le 4\\}$<\/span> . Tìm A\\B.<\/p>","options":["<strong>A.<\/strong> {–1 ; 0 ; 1 ; 2 ; 3 ; 4 ; 6 ; 8}","<strong>B.<\/strong> [–1 ; 0)","<strong>C.<\/strong> (–1 ; 0)","<strong>D.<\/strong> {–1}"],"correct":"4","level":"1","hint":"","answer":"<p>A = {–1 ; 0 ; 1 ; 2 ; 3} và B = {0 ; 1 ; 2 ; 3 ; 4} .<\/p><p>A\\B = {–1}<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> {–1}.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-09-20 02:00:46","option_type":"txt","len":2},{"id":"7267","mon_id":"1158767","chapter_id":"1158998","post_id":"6705","question":"<p>Vi\u1ebft t\u1eadp h\u1ee3p A = <span class=\"math-tex\">$\\{ x \\in Z | (2x-1)(x^2-5x+6) = 0 \\}$<\/span> b\u1eb1ng cách li\u1ec7t kê các ph\u1ea7n t\u1eed.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$A=\\bigg\\{ \\dfrac{1}{2};2;3\\bigg \\}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$A=\\{2;3\\}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$A=\\{-1;2\\}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$A=\\{-1;2;3\\}$<\/span>"],"correct":"2","level":"1","hint":"","answer":"<p>Ta có: (2x – 1)(x² – 5x + 6) = 0<\/p><p>⇔ 2x – 1 = 0 ho\u1eb7c x² – 5x + 6 = 0 <\/p><p>⇔ x = <span class=\"math-tex\">$\\dfrac{1}{2}$<\/span> ho\u1eb7c x = 2 ho\u0103c x = 3<\/p><p>Mà x ∈ Z nên x = 2 ho\u1eb7c x = 3.<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B.<\/strong> <span class=\"math-tex\">$A=\\{2;3\\}$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-09-20 02:11:16","option_type":"math","len":0}]}
