{"common":{"save":0,"post_id":"6465","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7071","mon_id":"1158767","chapter_id":"1158801","post_id":"6465","question":"<p>Nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng trình <span class=\"math-tex\">$\\sqrt{3x^2-3x+1}=\\sqrt{2x^2-2x+1}$<\/span> là<\/p>","options":["<strong>A.<\/strong> 0","<strong>B.<\/strong> 1","<strong>C.<\/strong> {0; 1}","<strong>D.<\/strong> Vô nghi\u1ec7m"],"correct":"3","level":"1","hint":"","answer":"<p>Vì 3x² – 3x + 1 > 0, v\u1edbi m\u1ecdi x và 2x² – 2x + 1 > 0 v\u1edbi m\u1ecdi x nên<\/p><p><span class=\"math-tex\">$\\sqrt{3x^2-3x+1}=\\sqrt{2x^2-2x+1}$<\/span><\/p><p>⇔ 3x² – 3x + 1 = 2x² – 2x + 1<\/p><p>⇔ x² – x = 0<\/p><p>⇔ x = 0 ho\u1eb7c x = 1.<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>C.<\/strong> {0; 1}.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-06-01 09:29:39","option_type":"txt","len":2},{"id":"7148","mon_id":"1158767","chapter_id":"1158801","post_id":"6465","question":"<p>Nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng trình <span class=\"math-tex\">$\\sqrt{2x^2-3x-5}=\\sqrt{x^2-7}$<\/span> là<\/p>","options":["<strong>A.<\/strong> 1.","<strong>B.<\/strong> 2.","<strong>C.<\/strong> {1; 2}.","<strong>D.<\/strong> Vô nghi\u1ec7m."],"correct":"4","level":"1","hint":"","answer":"<p>Thay các \u0111áp án vào ph\u01b0\u01a1ng trình, ch\u1ecdn <strong>D<\/strong>.<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>D.<\/strong> Vô nghi\u1ec7m.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-06-04 04:28:03","option_type":"txt","len":2},{"id":"7149","mon_id":"1158767","chapter_id":"1158801","post_id":"6465","question":"<p>Gi\u1ea3i ph\u01b0\u01a1ng trình <span class=\"math-tex\">$\\sqrt{2x^2-5x-9}=x-1$<\/span> <\/p>","options":["<strong>A.<\/strong> 5.","<strong>B.<\/strong> –2.","<strong>C.<\/strong> {5; –2}.","<strong>D.<\/strong> Vô nghi\u1ec7m."],"correct":"1","level":"1","hint":"","answer":"<p>Thay các \u0111áp án vào ph\u01b0\u01a1ng trình, \u0111áp án A \u0111\u01b0\u1ee3c \u0111\u1eb3ng th\u1ee9c \u0111úng nên ch\u1ecdn<strong> A<\/strong>.<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"> <strong>A.<\/strong> 5.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-06-04 04:30:25","option_type":"txt","len":2}]}
