Toán lớp 11 - Đề kiểm tra 45 phút - Toán lớp 11 - Tháng 9 - Số 1

{"save":1,"level":1,"time":"45","total":20,"point":5,"segment":[{"id":"58","test_id":"199","question":"<p>H&agrave;m s\u1ed1&nbsp;<span class=\"math-tex\">$y=\\cos x$<\/span>&nbsp;tu\u1ea7n ho&agrave;n v\u1edbi chu k&igrave;<\/p>","options":["A.&nbsp;<span class=\"math-tex\">$\\pi$<\/span>","B.&nbsp;<span class=\"math-tex\">$3\\pi$<\/span>","C.&nbsp;<span class=\"math-tex\">$2\\pi$<\/span>","D.&nbsp;<span class=\"math-tex\">$4 \\pi$<\/span>"],"correct":"3","answer":"<p>H&agrave;m s\u1ed1&nbsp;<span class=\"math-tex\">$y=\\cos ax$<\/span>&nbsp;tu\u1ea7n ho&agrave;n v\u1edbi chu k&igrave;&nbsp;<span class=\"math-tex\">$T = \\dfrac{{2\\pi }}{{\\left| a \\right|}}$<\/span><\/p><p>V\u1eady h&agrave;m s\u1ed1&nbsp;<span class=\"math-tex\">$y=\\cos x$<\/span>&nbsp;tu\u1ea7n ho&agrave;n v\u1edbi chu k&igrave;&nbsp;<span class=\"math-tex\">$T=2 \\pi$<\/span><\/p><p>\u0110&aacute;p &aacute;n C<\/p>","type":"choose","user_id":"88","test":"0","date":"2020-03-09 10:36:03"},{"id":"59","test_id":"199","question":"<p>T\u1eadp x&aacute;c \u0111\u1ecbnh c\u1ee7a h&agrave;m s\u1ed1&nbsp;<span class=\"math-tex\">$y = \\dfrac{{2020{x^2} + 1}}{{\\cos x}}$<\/span>&nbsp;l&agrave;:<\/p>","options":["A.&nbsp;<span class=\"math-tex\">$D=\\mathbb{R}$<\/span>","B.&nbsp;<span class=\"math-tex\">$D = R\\backslash \\left\\{ {\\dfrac{\\pi }{2} + k\\pi ,k \\in \\mathbb{Z} } \\right\\}$<\/span>","C.&nbsp;<span class=\"math-tex\">$D = R\\backslash \\left\\{ { k\\pi ,k \\in \\mathbb{Z} } \\right\\}$<\/span>","D.&nbsp;<span class=\"math-tex\">$D = R\\backslash \\left\\{ {\\dfrac{k\\pi }{2} ,k \\in \\mathbb{Z} } \\right\\}$<\/span>"],"correct":"2","answer":"<p>H&agrave;m s\u1ed1 x&aacute;c \u0111\u1ecbnh&nbsp;<span class=\"math-tex\">$\\Leftrightarrow \\cos x \\ne 0$<\/span><span class=\"math-tex\">$\\Leftrightarrow x \\ne \\dfrac{\\pi }{2} + k\\pi \\left( {k \\in \\mathbb{Z}} \\right)$<\/span><\/p><p>V\u1eady t\u1eadp x&aacute;c \u0111\u1ecbnh c\u1ee7a h&agrave;m s\u1ed1 l&agrave;&nbsp;<span class=\"math-tex\">$D = R\\backslash \\left\\{ {\\dfrac{\\pi }{2} + k\\pi ,k \\in \\mathbb{Z} } \\right\\}$<\/span><\/p><p>\u0110&aacute;p &aacute;n B<\/p>","type":"choose","user_id":"88","test":"0","date":"2020-03-09 10:40:41"}]}