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函数y=xsin2x的导数是

发布时间:2021-07-16

A.y′=sin2x-xcos2x

B.y′=sin2x-2xcos2x

C.y′=sin2x+xcos2x

D.y′=sin2x+2xcos2x

试卷相关题目

  • 1下列结论不正确的是

    A.若y=3,则y′=0

    B.若http://picflow.koolearn.com/upload/papers/g02/20120413/201204130934084561035.gif,则http://picflow.koolearn.com/upload/papers/g02/20120413/201204130934085031112.gif

    C.若http://picflow.koolearn.com/upload/papers/g02/20120413/201204130934085301006.gif,则http://picflow.koolearn.com/upload/papers/g02/20120413/201204130934085591117.gif

    D.若y=3x,则http://picflow.koolearn.com/upload/papers/g02/20120413/201204130934085911052.gif

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  • 2若f(x)=lnx,则f′(x)等于

    A.http://picflow.koolearn.com/upload/papers/g02/20120219/20120219141405016875.gif

    B.x

    C.lnx

    D.-x

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  • 3下列函数中导数是http://picflow.koolearn.com/upload/papers/g02/20120224/20120224155718840874.gif,x∈(0,+∞)(k为大于零的常数)的函数是

    A.ln(x+k)

    B.lnkx

    C.http://picflow.koolearn.com/upload/papers/g02/20120224/20120224155718847924.gif

    D.http://picflow.koolearn.com/upload/papers/g02/20120224/20120224155718854984.gif

    开始考试点击查看答案
  • 4函数 http://picflow.koolearn.com/upload/papers/20140824/20140824050845183447.png的定义域为 http://picflow.koolearn.com/upload/papers/20140824/20140824050845199303.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824050845214548.png对任意 http://picflow.koolearn.com/upload/papers/20140824/20140824050845246456.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824050845261598.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824050845277662.png 的解集为

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824050845292419.png

    B.(http://picflow.koolearn.com/upload/papers/20140824/20140824050845386286.png,+http://picflow.koolearn.com/upload/papers/20140824/20140824050845402273.png

    C.(http://picflow.koolearn.com/upload/papers/20140824/20140824050845386286.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824050845433225.png

    D.(http://picflow.koolearn.com/upload/papers/20140824/20140824050845433225.png,+http://picflow.koolearn.com/upload/papers/20140824/20140824050845402273.png

    开始考试点击查看答案
  • 5已知函数 http://picflow.koolearn.com/upload/papers/20140824/20140824051235112800.png在区间(0,1)内任取两个实数p,q,且p≠q,不等式 http://picflow.koolearn.com/upload/papers/20140824/20140824051235143888.png恒成立,则实数 http://picflow.koolearn.com/upload/papers/20140824/20140824051235159283.png的取值范围为(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824051235190508.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824051235206511.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824051235221517.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824051235237500.png

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  • 6定义方程f(x)= f′(x)的实数根x0叫做函数的“新驻点”,若函数g(x)=x,h(x)=ln(x+1),φ(x)=x3-1的“新驻点”分别为α,β,http://picflow.koolearn.com/upload/papers/g02/20110523/20110523114555756885.gif,则α,β,http://picflow.koolearn.com/upload/papers/g02/20111219/20111219091116001.gif的大小关系为

    A.α>β>http://picflow.koolearn.com/upload/papers/g02/20110523/20110523114555787885.gif

    B.β>α>http://picflow.koolearn.com/upload/papers/g02/20110523/20110523114555787885.gif

    C.http://picflow.koolearn.com/upload/papers/g02/20110523/20110523114555834885.gif>α>β

    D.α>http://picflow.koolearn.com/upload/papers/g02/20110523/20110523114555850885.gif>β

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  • 7已知二次函数f(x)=ax2+bx+c的导数为f′(x),f′(0)>0,对于任意实数x,有f(x)≥0,则http://picflow.koolearn.com/upload/papers/g02/20110104/20110104131550485998.gif的最小值为

    A.3

    B.http://picflow.koolearn.com/upload/papers/g02/20110104/20110104131701079881.gif

    C.2

    D.http://picflow.koolearn.com/upload/papers/g02/20110104/20110104131709063878.gif

    开始考试点击查看答案
  • 8等比数列{an}中,a1=2,a8=4,函数f(x)=x(x-a1)(x-a2)…(x-a8),则f′(0)=

    A.26

    B.29

    C.212

    D.215

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  • 9已知函数 http://picflow.koolearn.com/upload/papers/20140824/20140824054519155894.png,则( )

    A.http://picflow.koolearn.com/upload/papers/20140824/201408240545191711254.png

    B.http://picflow.koolearn.com/upload/papers/20140824/201408240545191871241.png

    C.http://picflow.koolearn.com/upload/papers/20140824/201408240545192181241.png

    D.http://picflow.koolearn.com/upload/papers/20140824/201408240545192331260.png

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  • 10已知定义在R上的函数f(x),其导函数f′(x)的大致图像如图所示,则下列叙述正确的是(  ) http://picflow.koolearn.com/upload/papers/20140824/201408240544239782230.jpg

    A.f(b)>f(c)>f(d)

    B.f(b)>f(a)>f(e)

    C.f(c)>f(b)>f(a)

    D.f(c)>f(e)>f(d)

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