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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

发布时间:2021-07-15

A.0<a

B.a≥e

C.a≥

D.a≥4

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  • 1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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  • 2f(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

    A.af(a)≤bf(b)

    B.af(a)≥bf(b)

    C.af(b)≤bf(a)

    D.af(b)≥bf(a)

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  • 3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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  • 4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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  • 5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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  • 6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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  • 7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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  • 8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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  • 9若函数y=x3+x2+mx+1是R上的单调函数,则实数m的取值范围是

    A.(http://picflow.koolearn.com/upload/papers/g02/20120818/20120818171914812619.png,+∞)

    B.(﹣∞,http://picflow.koolearn.com/upload/papers/g02/20120818/20120818171914869619.png]

    C.[http://picflow.koolearn.com/upload/papers/g02/20120818/20120818171914926619.png,+∞)

    D.(﹣∞,http://picflow.koolearn.com/upload/papers/g02/20120818/20120818171914983619.png

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  • 10对于R上可导的任意函数f(x),若满足(x﹣1)f′(x)≧0,则必有

    A.f(0)+f(2)<2f(1)

    B.f(0)+f(2)≦2f(1)

    C.f(0)+f(2)≧2f(1)

    D.f(0)+f(2)>2f(1)

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