{"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>Xét ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0\\space (a\\ne0)$<\/span> và bi\u1ec7t th\u1ee9c <span class=\"math-tex\">$\\Delta=b^2-4ac$<\/span>. N\u1ebfu Δ > 0 thì ph\u01b0\u01a1ng trình có hai nghi\u1ec7m<br \/>phân 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 <span style=\"color:#16a085;\"><strong>D.<\/strong> <span class=\"math-tex\">$x_{1,2}=\\dfrac{-b\\pm\\sqrt{\\Delta}}{2a}$<\/span><\/span><\/p><p>Xét ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0\\space (a\\ne0)$<\/span> và bi\u1ec7t th\u1ee9c <span class=\"math-tex\">$\\Delta=b^2-4ac$<\/span>.N\u1ebfu Δ > 0 thì ph\u01b0\u01a1ng trình có hai nghi\u1ec7m<br \/>phân bi\u1ec7t: <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 hàm s\u1ed1 <span class=\"math-tex\">$y=ax^2\\space (a\\ne 0)$<\/span> là m\u1ed9t \u0111\u01b0\u1eddng cong, g\u1ecdi là \u0111\u01b0\u1eddng Parabol có:<\/p>","options":["<strong>A.<\/strong> Tr\u1ee5c \u0111\u1ed1i x\u1ee9ng là Ox","<strong>B.<\/strong> O là \u0111i\u1ec3m cao nh\u1ea5t","<strong>C.<\/strong> O là \u0111i\u1ec3m th\u1ea5p nh\u1ea5t","<strong>D.<\/strong> Tr\u1ee5c \u0111\u1ed1i x\u1ee9ng là Oy"],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> Tr\u1ee5c \u0111\u1ed1i x\u1ee9ng là Oy<\/span><\/p><p>\u0110\u1ed3 th\u1ecb c\u1ee7a hàm s\u1ed1 <span class=\"math-tex\">$y=ax^2\\space (a\\ne 0)$<\/span> là m\u1ed9t \u0111\u01b0\u1eddng cong, g\u1ecdi là \u0111\u01b0\u1eddng Parabol có:<\/p><p>+ \u0110\u1ec9nh là g\u1ed1c t\u1ecda \u0111\u1ed9 O;<\/p><p>+ Tr\u1ee5c \u0111\u1ed1i x\u1ee9ng là 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 hàm s\u1ed1 <span class=\"math-tex\">$y=\\dfrac{3}{2}x^2$<\/span>. \u0110i\u1ec3m không thu\u1ed9c \u0111\u1ed3 th\u1ecb hàm s\u1ed1 này là:<\/p>","options":["<strong>A.<\/strong> (–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 <span style=\"color:#16a085;\"><strong>B.<\/strong> (2; 4)<\/span><\/p><p>Thay x = 2 vào ta \u0111\u01b0\u1ee3c <span class=\"math-tex\">$y=\\dfrac{3}{2}.2^2=6 \\ne 4$<\/span> suy ra \u0111i\u1ec3m (2; 4) không thu\u1ed9c \u0111\u1ed3 th\u1ecb hàm s\u1ed1 <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}]}
