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f(x)是定义在(0,+∞)上的非负可导函数,且满足xf"(x)≤f(x),对任意的正数a、b,若a<b,则必有

发布时间:2021-07-15

A.af(a)≤bf(b)

B.af(a)≥bf(b)

C.af(b)≤bf(a)

D.af(b)≥bf(a)

试卷相关题目

  • 1已知函数y=f(x-1)的图象关于点(1,0)对称,且当x∈(-∞,0)时,f(x)+xf′(x)<0成立(其中f′(x)是f(x)的导函数),若a=(30.3)·f(30.3),b=(logπ3)·f(logπ3),http://picflow.koolearn.com/upload/papers/g02/20110725/201107251557442611609.gif,则a,b,c的大小关系是

    A.a>b>c

    B.c>b>a

    C.c>a>b

    D.a>c>b

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  • 2如果函数f(x)=ax3﹣x2+x﹣5在(﹣∞,+∞)上单调递增,则实数a的取值范围是  

    A.(0,+∞)

    B.[0,+∞)

    C.(http://picflow.koolearn.com/upload/papers/g02/20120821/20120821162153385600.png,+∞)

    D.[http://picflow.koolearn.com/upload/papers/g02/20120821/20120821162153429600.png,+∞)

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  • 3设f′(x)是函数f(x)的导函数,将y=f(x)和y=f′(x)的图象画在同一个直角坐标系中,不可能正确的是

    A.http://picflow.koolearn.com/upload/papers/g02/20120822/201208222021357916415.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120822/201208222021358525964.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120822/201208222021359196211.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120822/201208222021363197180.png

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  • 4设f′(x)是函数f(x)的导函数,y=f′(x)的图象如图所示,则y=f(x)的图象最有可能的是http://picflow.koolearn.com/upload/papers/g02/20120818/201208181316066819269.png

    A.http://picflow.koolearn.com/upload/papers/g02/20120818/201208181316067728211.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120818/201208181316068397933.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120818/201208181316069078307.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120818/201208181316077469278.png

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  • 5定义在区间[0,a]上的函数f(x)的图象如图所示,记以A(0,f(0)),B(a,f(a)),C(x,f(x))为顶点的三角形的面积为S(x),则函数S(x)的导函数S"(x)的图象大致是http://picflow.koolearn.com/upload/papers/g02/20120826/201208261935119186039.png 

    A.http://picflow.koolearn.com/upload/papers/g02/20120826/201208261935119455362.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120826/201208261935119705469.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120826/201208261935120016022.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120826/201208261935120275512.png

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  • 6设f"(x)是函数f(x)的导函数,将y=f(x)和y=f"(x)的图象画在同一个直角坐标系中,不可能正确的是 

    A.http://picflow.koolearn.com/upload/papers/g02/20120828/201208281134316226386.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120828/201208281134316565988.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120828/201208281134316896077.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120828/201208281134320637192.png

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  • 7已知函数f(x)=http://picflow.koolearn.com/upload/papers/g02/20120818/201208180924507971384.png在[1,+∞]上为减函数,则a的取值范围是

    A.0<a

    B.a≥e

    C.a≥

    D.a≥4

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  • 8已知定义在实数集R上的函数f(x)满足f(1)=2,且f(x)的导数 f"(x)在R上恒有f"(x)<1(x∈R),则不等式f(x)<x+1的解集为

    A.(1,+∞)

    B.(﹣∞,﹣1)

    C.(﹣1,1)

    D.(﹣∞,﹣1)∪(1,+∞)

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  • 9已知函数f(x)=-mx3+nx2的图象在点(-1,2)处的切线恰好与直线3x+y=0平行,若 f(x)在区间[t,t+1]上单调递减,则实数t的取值范围是

    A.(-∞,-2]

    B.(-∞,-1]

    C.[-2,-1]

    D.[-2,+∞)

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  • 10设函数f(x)定义在实数集上,它的图象关于直线x=1对称,且当x≥1时,f(x)=lnx﹣x,则有 

    A.http://picflow.koolearn.com/upload/papers/g02/20120821/201208210748077353290.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120821/201208210748077803268.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120821/201208210748078253292.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120821/201208210748078703303.png

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