{"save":1,"level":1,"time":"60","total":25,"point":5,"segment":[{"id":"775","test_id":"278","question":"<p>R&uacute;t g\u1ecdn bi\u1ec3u th\u1ee9c <span class=\"math-tex\">$A=\\frac{\\sqrt[3]{{{a}^{5}}}.{{a}^{\\frac{7}{3}}}}{{{a}^{4}}.\\sqrt[7]{{{a}^{-2}}}}$<\/span> v\u1edbi a &gt; 0. Kh\u1eb3ng \u0111\u1ecbnh n&agrave;o sau \u0111&acirc;y \u0111&uacute;ng?<br \/>&nbsp;<\/p>","options":["<span class=\"math-tex\">${{a}^{\\frac{-2}{7}}}$<\/span>","<span class=\"math-tex\">$A={{a}^{\\frac{2}{7}}}$<\/span>","<span class=\"math-tex\">$A={{a}^{\\frac{7}{2}}}$<\/span>","<span class=\"math-tex\">${{a}^{\\frac{-7}{2}}}$<\/span>"],"correct":"2","answer":"<p><span class=\"math-tex\">$\\frac{\\sqrt[3]{{{a}^{5}}}.{{a}^{\\frac{7}{3}}}}{{{a}^{4}}.\\sqrt[7]{{{a}^{-2}}}}$<\/span><\/p><p><span class=\"math-tex\">$=\\frac{{{a}^{\\frac{5}{3}}}.{{a}^{\\frac{7}{3}}}}{{{a}^{4}}.{{a}^{-\\frac{2}{7}}}}$<\/span><\/p><p><span class=\"math-tex\">$={{a}^{\\frac{2}{7}}}$<\/span><\/p>","type":"choose","user_id":"108","test":"0","date":"2020-03-25 09:37:53"},{"id":"776","test_id":"278","question":"<p>Cho h&agrave;m s\u1ed1 <span class=\"math-tex\">$y=2\\sin x-\\cos x$<\/span>. \u0110\u1ea1o h&agrave;m c\u1ee7a h&agrave;m s\u1ed1 l&agrave;:<br \/>&nbsp;<\/p>","options":["<span class=\"math-tex\">$-2\\cos x-\\sin x$<\/span>","<span class=\"math-tex\">${y}'=-2\\cos x+\\sin x$<\/span>","<span class=\"math-tex\">${y}'=2\\cos x+\\sin x$<\/span>","<span class=\"math-tex\">${y}'=2\\cos x-\\sin x$<\/span>"],"correct":"3","answer":"<p><span class=\"math-tex\">$\\left( 2\\sin x-c\\text{os}x \\right)\\text{ }\\!\\!&rsquo;\\!\\!\\text{ =2cosx + sinx}$<\/span><\/p>","type":"choose","user_id":"108","test":"0","date":"2020-03-25 09:41:37"}]}