{"common":{"save":0,"post_id":"8068","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8803","post_id":"8068","mon_id":"1159278","chapter_id":"1159330","question":"<p>Ph\u01b0\u01a1ng trình <span class=\"math-tex\">$3x^2-(5-m)x+2-m=0$<\/span> (v\u1edbi m ∈ \u211d là tham s\u1ed1) có h\u1ec7 s\u1ed1 b là<\/p>","options":["<strong>A.<\/strong> 3","<strong>B.<\/strong> 5 – m","<strong>C.<\/strong> 2 – m","<strong>D.<\/strong> – (5 – m)"],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> – (5 – m).<\/span><\/p><p>H\u1ec7 s\u1ed1 b là – (5 – m).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-23 08:36:36","option_type":"txt","len":2},{"id":"8804","post_id":"8068","mon_id":"1159278","chapter_id":"1159330","question":"<p>Xét ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0$<\/span> và bi\u1ec7t th\u1ee9c <span class=\"math-tex\">$\\Delta=b^2-4ac$<\/span>. N\u1ebfu <span class=\"math-tex\">$\\Delta\\ge0$<\/span> thì ph\u01b0\u01a1ng trình<\/p>","options":["<strong>A.<\/strong> vô nghi\u1ec7m","<strong>B.<\/strong> vô s\u1ed1 nghi\u1ec7m","<strong>C.<\/strong> có nghi\u1ec7m","<strong>D.<\/strong> có hai nghi\u1ec7m phân bi\u1ec7t"],"correct":"3","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> có nghi\u1ec7m.<\/span><\/p><p>Xét ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0$<\/span> và bi\u1ec7t th\u1ee9c <span class=\"math-tex\">$\\Delta=b^2-4ac$<\/span>. <\/p><p>N\u1ebfu <span class=\"math-tex\">$\\Delta=0$<\/span> thì ph\u01b0\u01a1ng trình có nghi\u1ec7m kép.<\/p><p>N\u1ebfu <span class=\"math-tex\">$\\Delta>0$<\/span> thì ph\u01b0\u01a1ng trình có hai nghi\u1ec7m phân bi\u1ec7t.<\/p><p>Do \u0111ó <span class=\"math-tex\">$\\Delta\\ge0$<\/span> thì ph\u01b0\u01a1ng trình có nghi\u1ec7m.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-23 08:39:45","option_type":"txt","len":2},{"id":"8805","post_id":"8068","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho hàm s\u1ed1 <span class=\"math-tex\">$y=-\\dfrac{3}{2}x^2$<\/span>. \u0110i\u1ec3m không thu\u1ed9c \u0111\u1ed3 th\u1ecb là<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$(-2;-6)$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\bigg(-1;-\\dfrac{3}{2}\\bigg)$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$(-2;6)$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$(2;-6)$<\/span>"],"correct":"3","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$(-2;6)$<\/span>.<\/span><\/p><p>Thay x = –2 ta \u0111\u01b0\u1ee3c y = <span class=\"math-tex\">$-\\dfrac{3}{2}.(-2)^2=-6$<\/span> nên \u0111i\u1ec3m (–2 ; 6) không thu\u1ed9c \u0111\u1ed3 th\u1ecb.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-23 08:42:33","option_type":"math","len":0}]}