Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"7948","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8720","post_id":"7948","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0\\;(a\\ne0)$<\/span>. N\u1ebfu <span class=\"math-tex\">$x_1,x_2$<\/span> là hai nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng trình thì:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$x_1+x_2=\\dfrac{-b}{a}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$x_1+x_2=\\dfrac{b}{a}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$x_1+x_2=\\dfrac{-b}{2a}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$x_1+x_2=\\dfrac{b}{2a}$<\/span>"],"correct":"1","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> <span class=\"math-tex\">$x_1+x_2=\\dfrac{-b}{a}$<\/span><\/span><\/p><p>Cho ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0\\;(a\\ne0)$<\/span>. N\u1ebfu <span class=\"math-tex\">$x_1,x_2$<\/span> là hai nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng trình thì: <\/p><p><span style=\"color:#16a085;\"><span class=\"math-tex\">$x_1+x_2=\\dfrac{-b}{a}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-21 07:58:56","option_type":"math","len":0},{"id":"8721","post_id":"7948","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0\\;(a\\ne0)$<\/span>. N\u1ebfu <span class=\"math-tex\">$x_1,x_2$<\/span> là hai nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng trình thì: <\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$x_1.x_2=\\dfrac{-c}{a}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$x_1.x_2=\\dfrac{a}{c}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$x_1.x_2=\\dfrac{-a}{c}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$x_1.x_2=\\dfrac{c}{a}$<\/span>"],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> <span class=\"math-tex\">$x_1.x_2=\\dfrac{c}{a}$<\/span><\/span><\/p><p>Cho ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0\\;(a\\ne0)$<\/span>. N\u1ebfu <span class=\"math-tex\">$x_1,x_2$<\/span> là hai nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng trình thì: <\/p><p><span style=\"color:#16a085;\"><span class=\"math-tex\">$x_1.x_2=\\dfrac{c}{a}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-21 08:02:05","option_type":"math","len":0},{"id":"8722","post_id":"7948","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0\\;(a\\ne0)$<\/span>. N\u1ebfu <span class=\"math-tex\">$a+b+c=0$<\/span> thì ph\u01b0\u01a1ng trình có hai nghi\u1ec7m là:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$x_1=1;x_2=\\dfrac{-b}{a}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$x_1=1;x_2=\\dfrac{-c}{a}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$x_1=1;x_2=\\dfrac{c}{a}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$x_1=-1;x_2=\\dfrac{-c}{a}$<\/span>"],"correct":"3","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$x_1=1;x_2=\\dfrac{c}{a}$<\/span><\/span><\/p><p>Cho ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0\\;(a\\ne0)$<\/span>. N\u1ebfu <span class=\"math-tex\">$a+b+c=0$<\/span> thì ph\u01b0\u01a1ng trình có hai nghi\u1ec7m là:<\/p><p><span style=\"color:#16a085;\"><span class=\"math-tex\">$x_1=1;x_2=\\dfrac{c}{a}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-21 08:04:54","option_type":"math","len":0}]}