{"common":{"save":0,"post_id":"6702","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7262","mon_id":"1158767","chapter_id":"1158999","post_id":"6702","question":"<p>Tính giá tr\u1ecb c\u1ee7a hàm s\u1ed1 <span class=\"math-tex\">$y=f(x)=\\dfrac{1}{x-2}$<\/span> t\u1ea1i x = 1.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$f(1)=1$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$f(1)=-1$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$f(1)=0$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$f(1)=\\dfrac{1}{2}$<\/span>"],"correct":"2","level":"1","hint":"","answer":"<p>Ta có: <span class=\"math-tex\">$f(1)=\\dfrac{1}{1-2}=-1$<\/span><\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> <span class=\"math-tex\">$f(1)=-1$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-09-20 01:50:08","option_type":"math","len":0},{"id":"7264","mon_id":"1158767","chapter_id":"1158999","post_id":"6702","question":"<p>Xác \u0111\u1ecbnh t\u1ecda \u0111\u1ed9 t\u1ea5t c\u1ea3 các giao \u0111i\u1ec3m c\u1ee7a parapol <span class=\"math-tex\">$y=x^2-3x+2$<\/span> v\u1edbi tr\u1ee5c hoành Ox.<\/p>","options":["<strong>A.<\/strong> M(1; 0) và N(2; 0)","<strong>B.<\/strong> M(0; 2) ","<strong>C.<\/strong> M(0; 1) và N(0; 2)","<strong>D.<\/strong> N(1; 2)"],"correct":"1","level":"1","hint":"","answer":"<p>Ph\u01b0\u01a1ng trình hoành \u0111\u1ed9 giao \u0111i\u1ec3m c\u1ee7a <span class=\"math-tex\">$y=x^2-3x+2$<\/span> v\u1edbi tr\u1ee5c hoành là:<\/p><p><span class=\"math-tex\">$x^2-3x+2=0$<\/span><\/p><p><span class=\"math-tex\">$\\Leftrightarrow$<\/span> x = 1 ho\u1eb7c x = 2<\/p><p>V\u1edbi x = 1 ta có y = 0 suy ra \u0111i\u1ec3m M(1; 0).<\/p><p>V\u1edbi x = 2 ta có y = 0 suy ra \u0111i\u1ec3m N(2; 0).<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> M(1; 0) và N(2; 0)<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-09-20 01:58:42","option_type":"txt","len":2},{"id":"7266","mon_id":"1158767","chapter_id":"1158999","post_id":"6702","question":"<p>Tìm t\u1eadp xác \u0111\u1ecbnh c\u1ee7a hàm s\u1ed1 <span class=\"math-tex\">$y=\\dfrac{\\sqrt{x+3}}{x-1}$<\/span>.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$D=[-3;+\\infty )$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$D=[-3;+\\infty )\\setminus\\{-1\\}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$D=[-3;+\\infty )\\setminus\\{1\\}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$D=(-3;+\\infty )\\setminus\\{1\\}$<\/span>"],"correct":"3","level":"1","hint":"","answer":"<p>Hàm s\u1ed1 xác \u0111\u1ecbnh khi<\/p><p><span class=\"math-tex\">$\\begin{cases}x+3\\ge0\\\\x-1\\ne0\\end{cases}$<\/span> <span class=\"math-tex\">$\\Leftrightarrow \\begin{cases}x\\ge-3\\\\x\\ne1\\end{cases}$<\/span> <span class=\"math-tex\">$\\Leftrightarrow x\\in [-3;+\\infty )\\setminus\\{1\\}$<\/span><\/p><p>V\u1eady t\u1eadp xác \u0111\u1ecbnh c\u1ee7a hàm s\u1ed1 là <span class=\"math-tex\">$D=[-3;+\\infty )\\setminus\\{1\\}$<\/span><\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$D=[-3;+\\infty )\\setminus\\{1\\}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-09-20 02:07:18","option_type":"math","len":0}]}