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

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

45:00

{"save":1,"level":1,"time":"45","total":20,"point":5,"segment":[{"id":"58","test_id":"199","question":"Hàm s\u1ed1 $y=\\cos x$<\/span> tu\u1ea7n hoàn v\u1edbi chu kì<\/p>","options":["A. $\\pi$<\/span>","B. $3\\pi$<\/span>","C. $2\\pi$<\/span>","D. $4 \\pi$<\/span>"],"correct":"3","answer":"Hàm s\u1ed1 $y=\\cos ax$<\/span> tu\u1ea7n hoàn v\u1edbi chu kì $T = \\dfrac{{2\\pi }}{{\\left| a \\right|}}$<\/span><\/p>V\u1eady hàm s\u1ed1 $y=\\cos x$<\/span> tu\u1ea7n hoàn v\u1edbi chu kì $T=2 \\pi$<\/span><\/p>\u0110áp án C<\/p>","type":"choose","user_id":"88","test":"0","date":"2020-03-09 10:36:03"},{"id":"59","test_id":"199","question":"T\u1eadp xác \u0111\u1ecbnh c\u1ee7a hàm s\u1ed1 $y = \\dfrac{{2020{x^2} + 1}}{{\\cos x}}$<\/span> là:<\/p>","options":["A. $D=\\mathbb{R}$<\/span>","B. $D = R\\backslash \\left\\{ {\\dfrac{\\pi }{2} + k\\pi ,k \\in \\mathbb{Z} } \\right\\}$<\/span>","C. $D = R\\backslash \\left\\{ { k\\pi ,k \\in \\mathbb{Z} } \\right\\}$<\/span>","D. $D = R\\backslash \\left\\{ {\\dfrac{k\\pi }{2} ,k \\in \\mathbb{Z} } \\right\\}$<\/span>"],"correct":"2","answer":"Hàm s\u1ed1 xác \u0111\u1ecbnh $\\Leftrightarrow \\cos x \\ne 0$<\/span>$\\Leftrightarrow x \\ne \\dfrac{\\pi }{2} + k\\pi \\left( {k \\in \\mathbb{Z}} \\right)$<\/span><\/p>V\u1eady t\u1eadp xác \u0111\u1ecbnh c\u1ee7a hàm s\u1ed1 là $D = R\\backslash \\left\\{ {\\dfrac{\\pi }{2} + k\\pi ,k \\in \\mathbb{Z} } \\right\\}$<\/span><\/p>\u0110áp án B<\/p>","type":"choose","user_id":"88","test":"0","date":"2020-03-09 10:40:41"}]}