{"common":{"save":0,"post_id":"6181","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5373","mon_id":"1158767","chapter_id":"1158801","post_id":"6181","question":"<p>Tìm t\u1eadp xác \u0111\u1ecbnh c\u1ee7a hàm s\u1ed1 <span class=\"math-tex\">$y=\\dfrac{x}{x^2+3x+2}$<\/span>.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$D=\\mathbb{R}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$D=\\mathbb{R} \\setminus \\{-1;-2\\}$<\/span> ","<strong>C.<\/strong> <span class=\"math-tex\">$D=\\mathbb{R} \\setminus \\{-1\\}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$D=\\mathbb{R} \\setminus \\{-2\\}$<\/span>"],"correct":"2","level":"2","hint":"","answer":"<p>Bi\u1ec3u th\u1ee9c <span class=\"math-tex\">$\\dfrac{x}{x^2+3x+2}$<\/span> có ngh\u0129a khi <span class=\"math-tex\">$x^2+3x+2\\ne0$<\/span> ⇔ <span class=\"math-tex\">$\\begin{cases}x\\ne-1\\\\x\\ne-2\\end{cases}$<\/span>.<\/p><p>V\u1eady t\u1eadp xác \u0111\u1ecbnh c\u1ee7a hàm s\u1ed1 <span class=\"math-tex\">$y=\\dfrac{1}{x-2}$<\/span> là<\/p><p><span style=\"color:#16a085;\"><strong>B.<\/strong> <span class=\"math-tex\">$D=\\mathbb{R} \\setminus \\{-1;-2\\}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2022-09-03 14:31:15","option_type":"math","len":0},{"id":"5374","mon_id":"1158767","chapter_id":"1158801","post_id":"6181","question":"<p>Tìm t\u1eadp xác \u0111\u1ecbnh c\u1ee7a hàm s\u1ed1 <span class=\"math-tex\">$y=\\sqrt{x-3}$<\/span>.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$D=\\mathbb{R}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$D=[-3;+\\infty)$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$D=[3;+\\infty)$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$D=(3;+\\infty)$<\/span>"],"correct":"3","level":"2","hint":"","answer":"<p>Bi\u1ec3u th\u1ee9c <span class=\"math-tex\">$\\sqrt{x-3}$<\/span> có ngh\u0129a khi <span class=\"math-tex\">$x-3\\geq0$<\/span> ⇔ <span class=\"math-tex\">$x\\geq3$<\/span>.<\/p><p>V\u1eady t\u1eadp xác \u0111\u1ecbnh c\u1ee7a hàm s\u1ed1 <span class=\"math-tex\">$y=\\sqrt{x-3}$<\/span> là<\/p><p><span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$D=[3;+\\infty)$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2022-09-03 14:38:09","option_type":"math","len":0},{"id":"5376","mon_id":"1158767","chapter_id":"1158801","post_id":"6181","question":"<p>Tìm t\u1eadp xác \u0111\u1ecbnh c\u1ee7a hàm s\u1ed1 <span class=\"math-tex\">$y=\\dfrac{3}{\\sqrt{x+1}}$<\/span>.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$D=(1;+\\infty)$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$D=[-1;+\\infty)$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$D=(-\\infty;-1)$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$D=(-1;+\\infty)$<\/span>"],"correct":"4","level":"2","hint":"","answer":"<p>Bi\u1ec3u th\u1ee9c <span class=\"math-tex\">$\\dfrac{3}{\\sqrt{x+1}}$<\/span> có ngh\u0129a khi <span class=\"math-tex\">$x+1>0\\Leftrightarrow x>-1$<\/span>.<\/p><p>V\u1eady t\u1eadp xác \u0111\u1ecbnh c\u1ee7a hàm s\u1ed1 <span class=\"math-tex\">$y=\\dfrac{3}{\\sqrt{x+1}}$<\/span> là<\/p><p><span style=\"color:#16a085;\"><strong>D.<\/strong> <span class=\"math-tex\">$D=(-1;+\\infty)$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2022-09-04 02:16:59","option_type":"math","len":0}]}
