{"common":{"save":0,"post_id":"7945","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8514","post_id":"7945","mon_id":"1159278","chapter_id":"1159330","question":"<p>Ph\u01b0\u01a1ng tr&igrave;nh b\u1eadc hai m\u1ed9t \u1ea9n (n&oacute;i g\u1ecdn l&agrave; ph\u01b0\u01a1ng tr&igrave;nh b\u1eadc&nbsp;hai) l&agrave; ph\u01b0\u01a1ng tr&igrave;nh c&oacute; d\u1ea1ng:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$ax^2+bx+c=0(a\\ne 0)$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$ax^2+bx+c=0(b\\ne 0)$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$ax^2+bx+c=0(c\\ne 0)$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$ax^2+bx^2+c=0(a,b\\ne 0)$<\/span>"],"correct":"1","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$ax^2+bx+c=0(a\\ne 0)$<\/span><\/span><\/p><p>Ph\u01b0\u01a1ng tr&igrave;nh b\u1eadc hai m\u1ed9t \u1ea9n (n&oacute;i g\u1ecdn l&agrave; ph\u01b0\u01a1ng tr&igrave;nh b\u1eadc&nbsp;hai) l&agrave; ph\u01b0\u01a1ng tr&igrave;nh c&oacute; d\u1ea1ng:<\/p><p><span class=\"math-tex\">$ax^2+bx+c=0(a\\ne 0)$<\/span><\/p><p>trong \u0111&oacute; a, b, c l&agrave; c&aacute;c s\u1ed1 th\u1ef1c cho tr\u01b0\u1edbc v&agrave; x l&agrave; \u1ea9n s\u1ed1.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-13 08:35:11","option_type":"math","len":0},{"id":"8613","post_id":"7945","mon_id":"1159278","chapter_id":"1159330","question":"<p>X&eacute;t ph\u01b0\u01a1ng tr&igrave;nh b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0(a\\ne0)$<\/span>&nbsp;v&agrave; bi\u1ec7t th\u1ee9c&nbsp;<span class=\"math-tex\">$\\Delta=b^2-4ac$<\/span>.&nbsp;N\u1ebfu <span class=\"math-tex\">$\\Delta &lt;0$<\/span> th&igrave; ph\u01b0\u01a1ng tr&igrave;nh:<\/p>","options":["<strong>A.<\/strong> v&ocirc; nghi\u1ec7m","<strong>B.<\/strong> c&oacute; nghi\u1ec7m k&eacute;p <span class=\"math-tex\">$x_1=x_2=\\dfrac{-b}{2a}$<\/span>","<strong>C.<\/strong> c&oacute; nghi\u1ec7m k&eacute;p <span class=\"math-tex\">$x_{1,2}=\\dfrac{-b\\pm\\sqrt{\\Delta}}{2a}$<\/span>","<strong>D.<\/strong> c&oacute; nghi\u1ec7m"],"correct":"1","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong>&nbsp;v&ocirc; nghi\u1ec7m<\/span><\/p><p>X&eacute;t ph\u01b0\u01a1ng tr&igrave;nh b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0(a\\ne0)$<\/span>&nbsp;v&agrave; bi\u1ec7t th\u1ee9c&nbsp;<span class=\"math-tex\">$\\Delta=b^2-4ac$<\/span>.&nbsp;<\/p><p>N\u1ebfu <span class=\"math-tex\">$\\Delta &lt;0$<\/span> th&igrave; ph\u01b0\u01a1ng tr&igrave;nh v&ocirc; nghi\u1ec7m.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-17 08:57:52","option_type":"math","len":0},{"id":"8614","post_id":"7945","mon_id":"1159278","chapter_id":"1159330","question":"<p>X&eacute;t ph\u01b0\u01a1ng tr&igrave;nh b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0(a\\ne0)$<\/span>&nbsp;v&agrave; bi\u1ec7t th\u1ee9c&nbsp;<span class=\"math-tex\">$\\Delta=b^2-4ac$<\/span>.&nbsp;N\u1ebfu <span class=\"math-tex\">$\\Delta =0$<\/span> th&igrave; ph\u01b0\u01a1ng tr&igrave;nh c&oacute; nghi\u1ec7m k&eacute;p:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$x_1=x_2=\\dfrac{-b}{a}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$x_1=x_2=\\dfrac{b}{2a}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$x_1=x_2=\\dfrac{b}{2}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$x_1=x_2=\\dfrac{-b}{2a}$<\/span>"],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;<span class=\"math-tex\">$x_1=x_2=\\dfrac{-b}{2a}$<\/span><\/span><\/p><p>X&eacute;t ph\u01b0\u01a1ng tr&igrave;nh b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0(a\\ne0)$<\/span>&nbsp;v&agrave; bi\u1ec7t th\u1ee9c&nbsp;<span class=\"math-tex\">$\\Delta=b^2-4ac$<\/span>.&nbsp;<\/p><p>N\u1ebfu <span class=\"math-tex\">$\\Delta =0$<\/span> th&igrave; ph\u01b0\u01a1ng tr&igrave;nh c&oacute; nghi\u1ec7m k&eacute;p:&nbsp;<span class=\"math-tex\">$x_1=x_2=\\dfrac{-b}{2a}$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-17 09:00:08","option_type":"math","len":0}]}