{"common":{"save":0,"post_id":"8055","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8680","post_id":"8055","mon_id":"1159278","chapter_id":"1159330","question":"<p>X&eacute;t ph\u01b0\u01a1ng tr&igrave;nh b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0\\space (a\\ne0)$<\/span>&nbsp;v&agrave; bi\u1ec7t&nbsp;th\u1ee9c <span class=\"math-tex\">$\\Delta=b^2-4ac$<\/span>. N\u1ebfu &Delta; &gt; 0 th&igrave; ph\u01b0\u01a1ng tr&igrave;nh c&oacute; hai nghi\u1ec7m<br \/>ph&acirc;n bi\u1ec7t:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$x_{1,2}=\\dfrac{\\pm b-\\sqrt{\\Delta}}{2a}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$x_{1,2}=\\dfrac{\\pm b+\\sqrt{\\Delta}}{2a}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$x_{1,2}=\\dfrac{b\\pm\\sqrt{\\Delta}}{2a}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$x_{1,2}=\\dfrac{-b\\pm\\sqrt{\\Delta}}{2a}$<\/span>"],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;<span class=\"math-tex\">$x_{1,2}=\\dfrac{-b\\pm\\sqrt{\\Delta}}{2a}$<\/span><\/span><\/p><p>X&eacute;t ph\u01b0\u01a1ng tr&igrave;nh b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0\\space (a\\ne0)$<\/span>&nbsp;v&agrave; bi\u1ec7t&nbsp;th\u1ee9c <span class=\"math-tex\">$\\Delta=b^2-4ac$<\/span>.N\u1ebfu &Delta; &gt; 0 th&igrave; ph\u01b0\u01a1ng tr&igrave;nh c&oacute; hai nghi\u1ec7m<br \/>ph&acirc;n bi\u1ec7t:&nbsp;<span style=\"color:#16a085;\"><span class=\"math-tex\">$x_{1,2}=\\dfrac{-b\\pm\\sqrt{\\Delta}}{2a}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-18 08:47:32","option_type":"math","len":0},{"id":"8681","post_id":"8055","mon_id":"1159278","chapter_id":"1159330","question":"<p>\u0110\u1ed3 th\u1ecb c\u1ee7a h&agrave;m s\u1ed1&nbsp;<span class=\"math-tex\">$y=ax^2\\space (a\\ne 0)$<\/span>&nbsp;l&agrave; m\u1ed9t \u0111\u01b0\u1eddng cong,&nbsp;g\u1ecdi l&agrave; \u0111\u01b0\u1eddng Parabol c&oacute;:<\/p>","options":["<strong>A.<\/strong> Tr\u1ee5c \u0111\u1ed1i x\u1ee9ng l&agrave; Ox","<strong>B.<\/strong> O l&agrave; \u0111i\u1ec3m cao nh\u1ea5t","<strong>C.<\/strong> O l&agrave; \u0111i\u1ec3m th\u1ea5p nh\u1ea5t","<strong>D.<\/strong> Tr\u1ee5c \u0111\u1ed1i x\u1ee9ng l&agrave; Oy"],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;Tr\u1ee5c \u0111\u1ed1i x\u1ee9ng l&agrave; Oy<\/span><\/p><p>\u0110\u1ed3 th\u1ecb c\u1ee7a h&agrave;m s\u1ed1&nbsp;<span class=\"math-tex\">$y=ax^2\\space (a\\ne 0)$<\/span>&nbsp;l&agrave; m\u1ed9t \u0111\u01b0\u1eddng cong,&nbsp;g\u1ecdi l&agrave; \u0111\u01b0\u1eddng Parabol c&oacute;:<\/p><p>+ \u0110\u1ec9nh l&agrave; g\u1ed1c t\u1ecda \u0111\u1ed9 O;<\/p><p>+ Tr\u1ee5c \u0111\u1ed1i x\u1ee9ng l&agrave; Oy.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-18 08:49:21","option_type":"txt","len":2},{"id":"8683","post_id":"8055","mon_id":"1159278","chapter_id":"1159330","question":"<p>Cho h&agrave;m s\u1ed1&nbsp;<span class=\"math-tex\">$y=\\dfrac{3}{2}x^2$<\/span>. \u0110i\u1ec3m kh&ocirc;ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h&agrave;m s\u1ed1 n&agrave;y l&agrave;:<\/p>","options":["<strong>A.<\/strong> (&ndash;2; 6)","<strong>B.<\/strong> (2; 4)","<strong>C.<\/strong> <span class=\"math-tex\">$\\bigg(-1;\\dfrac{3}{2}\\bigg)$<\/span>","<strong>D.<\/strong> (2; 6)"],"correct":"2","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong>&nbsp;(2; 4)<\/span><\/p><p>Thay x = 2 v&agrave;o ta \u0111\u01b0\u1ee3c&nbsp;<span class=\"math-tex\">$y=\\dfrac{3}{2}.2^2=6 \\ne 4$<\/span>&nbsp;suy ra \u0111i\u1ec3m (2; 4) kh&ocirc;ng thu\u1ed9c \u0111\u1ed3 th\u1ecb h&agrave;m s\u1ed1&nbsp;<span class=\"math-tex\">$y=\\dfrac{3}{2}x^2$<\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-18 08:52:23","option_type":"math","len":0}]}