{"common":{"save":0,"post_id":"8056","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8686","post_id":"8056","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho hàm s\u1ed1 <span class=\"math-tex\">$y=ax^2\\space (a\\ne 0)$<\/span> có \u0111\u1ed3 th\u1ecb hàm s\u1ed1 là (P). Bi\u1ebft r\u1eb1ng (P) \u0111i qua \u0111i\u1ec3m M(–2; 4). Khi \u0111ó:<\/p>","options":["<strong>A.<\/strong> a = 2","<strong>B.<\/strong> a = –1","<strong>C.<\/strong> a = 1","<strong>D.<\/strong> a = –2"],"correct":"3","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> a = 1<\/span><\/p><p>Vì (P) \u0111i qua \u0111i\u1ec3m M(–2; 4) nên 4 = a . (–2)² suy ra a = 1.<\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"127","test":"0","date":"2024-11-18 09:01:53","option_type":"txt","len":0},{"id":"8688","post_id":"8056","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho \u0111i\u1ec3m M(1; 2) thu\u1ed9c \u0111\u1ed3 th\u1ecb hàm s\u1ed1 <span class=\"math-tex\">$y=ax^2\\space (a\\ne0)$<\/span>. Tìm h\u1ec7 s\u1ed1 a c\u1ee7a hàm s\u1ed1. <\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$a=2$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$a=-2$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$a=-\\dfrac{1}{2}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$a=\\dfrac{1}{2}$<\/span>"],"correct":"1","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> <span class=\"math-tex\">$a=2$<\/span><\/span><\/p><p>Vì \u0111i\u1ec3m M(1; 2) thu\u1ed9c \u0111\u1ed3 th\u1ecb hàm s\u1ed1 <span class=\"math-tex\">$y=ax^2\\space (a\\ne0)$<\/span> nên <span class=\"math-tex\">$2=a.1^2$<\/span> suy ra <span class=\"math-tex\">$a=2$<\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-18 09:04:48","option_type":"math","len":0},{"id":"8689","post_id":"8056","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho hàm s\u1ed1 <span class=\"math-tex\">$y=(3m+1)x^2$<\/span> v\u1edbi <span class=\"math-tex\">$m\\ne-\\dfrac{1}{3}$<\/span>. Tìm các giá tr\u1ecb c\u1ee7a tham s\u1ed1 m \u0111\u1ec3 \u0111\u1ed3 th\u1ecb hàm s\u1ed1 \u0111i qua \u0111i\u1ec3m <span class=\"math-tex\">$A\\bigg( \\dfrac{1}{2};\\dfrac{1}{4}\\bigg)$<\/span>.<\/p>","options":["<strong>A. <\/strong>m = 1","<strong>B.<\/strong> m = 0","<strong>C.<\/strong> m = 2","<strong>D.<\/strong> m = –1"],"correct":"2","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> m = 0<\/span><\/p><p>\u0110\u1ec3 \u0111\u1ed3 th\u1ecb hàm s\u1ed1 \u0111i qua \u0111i\u1ec3m <span class=\"math-tex\">$A\\bigg( \\dfrac{1}{2};\\dfrac{1}{4}\\bigg)$<\/span> thì <span class=\"math-tex\">$\\dfrac{1}{4}=(3m+1).\\bigg(\\dfrac{1}{2}\\bigg)^2$<\/span><\/p><p>Suy ra 3m + 1 = 1 suy ra m = 0.<\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"127","test":"0","date":"2024-11-18 09:08:31","option_type":"txt","len":0}]}