Toán lớp 12 - Đề kiểm tra 15 phút - Toán lớp 12 - Tháng 9 - Số 2

{"save":1,"level":1,"time":"15","total":10,"point":5,"segment":[{"id":"28","test_id":"195","question":"<p>T\u1eadp nghi\u1ec7m c\u1ee7a b\u1ea5t ph\u01b0\u01a1ng tr&igrave;nh&nbsp;<span class=\"math-tex\">${{\\log }_{\\frac{1}{2}}}\\left( \\frac{1}{{{x}^{2}}+4x-5} \\right)&gt;{{\\log }_{2}}\\left( x-7 \\right)$<\/span>&nbsp;l&agrave;:<\/p>","options":["<span class=\"math-tex\">$\\left( -\\infty ;1 \\right)$<\/span>","<span class=\"math-tex\">$\\left( -\\infty ;7 \\right)$<\/span>","<span class=\"math-tex\">$\\left( -2;+\\infty \\right)$<\/span>","<span class=\"math-tex\">$\\left( 7;+\\infty \\right)$<\/span>"],"correct":"4","answer":"<p><span><span>TX\u0110 : x &isin;<\/span> (7 ; <span class=\"math-tex\">$+\\infty$<\/span><\/span>) (1)<\/p><p><span><span>Bpt\u27fa<\/span> log<sub>2<\/sub>(x<sup>2<\/sup> + 4x -5) &gt; log<sub>2<\/sub>(x-7)<\/span><\/p><p><span><span>&hArr;<\/span> x<sup>2<\/sup> -3x + 2 &gt; 0<\/span><\/p><p><span><span>&hArr; x &isin; (<span class=\"math-tex\">$-\\infty$<\/span>&nbsp;; 1) &cup; (2 ; <span class=\"math-tex\">$+\\infty$<\/span>) (2)<\/span><\/span><\/p><p><span><span>T\u1eeb (1) ; (2) \u27f9 x &isin; <\/span>(7 ; <span class=\"math-tex\">$+\\infty$<\/span><\/span>)<\/p>","type":"choose","user_id":"108","test":"0","date":"2020-03-07 00:03:48"},{"id":"29","test_id":"195","question":"<p>Cho h&agrave;m s\u1ed1&nbsp;<span class=\"math-tex\">$y={{e}^{x}}+{{e}^{-x}}$<\/span>&nbsp;.T&iacute;nh&nbsp;<span class=\"math-tex\">${y}&rsquo;&rsquo;\\left( 1 \\right).$<\/span><\/p>","options":["<span class=\"math-tex\">$e+\\frac{1}{e}$<\/span>","<span class=\"math-tex\">$e-\\frac{1}{e}$<\/span>","<span class=\"math-tex\">$-e+\\frac{1}{e}$<\/span>","<span class=\"math-tex\">$-e-\\frac{1}{e}$<\/span>"],"correct":"1","answer":"<p><span class=\"math-tex\">$y&rsquo;={{({{e}^{-x}}+{{e}^{x}})}^{&rsquo;}}=-\\frac{1}{{{e}^{x}}}+{{e}^{x}} \\n\\n$<\/span>&nbsp;<\/p><p><span class=\"math-tex\">$y&rsquo;&rsquo;=\\frac{1}{{{e}^{x}}}+{{e}^{x}}$<\/span><\/p><p>Thay s\u1ed1 ta \u0111\u01b0\u1ee3c \u0111&aacute;p &aacute;n 1.<\/p>","type":"choose","user_id":"108","test":"0","date":"2020-03-07 00:12:17"}]}