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已知f(x)=x 3-6x 2+9x-abc,a<b<c,且f(a)=f(b)=f(c)=0.现给出如下结论: ①f(0)f(1)>0;②f(0)f(1)<0;③f(0)f(3)>0; ④f(0)f(3)<0. 其中正确结论的序号是(  )

发布时间:2021-07-16

A.①③

B.①④

C.②③

D.②④

试卷相关题目

  • 1函数f(x)= http://picflow.koolearn.com/upload/papers/20140824/20140824035620529327.pngx 3- http://picflow.koolearn.com/upload/papers/20140824/20140824035620544338.pngax 2+(a-1)x+1在区间(1,5)上为减函数,在区间(6,+∞)上为增函数,则实数a的取值范围是(  )

    A.[4,5]

    B.[3,5]

    C.[5,6]

    D.[6,7]

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  • 2http://picflow.koolearn.com/upload/papers/20140824/20140824035816172814.png则f′(x) http://picflow.koolearn.com/upload/papers/20140824/20140824035816187313.png的解集为(    )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824035816203533.png

    B.(-1,0)http://picflow.koolearn.com/upload/papers/20140824/20140824035816219605.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824035816234548.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824035816250452.png

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  • 3设函数 http://picflow.koolearn.com/upload/papers/20140824/20140824042328329447.png是定义在 http://picflow.koolearn.com/upload/papers/20140824/20140824042328345515.png上的可导函数,其导函数为 http://picflow.koolearn.com/upload/papers/20140824/20140824042328360481.png,且有 http://picflow.koolearn.com/upload/papers/20140824/20140824042328360807.png,则不等式 http://picflow.koolearn.com/upload/papers/20140824/201408240423283761092.png的解集为(    )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824042328392700.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824042328407625.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824042328438730.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824042328454656.png

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  • 4函数 y= xcos x-sin x在下面哪个区间内是增函数 (  ).

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824040651472781.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824040651487562.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824040651503822.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824040651519607.png

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  • 5函数y=2x 3+1的图象与函数y=3x 2-b的图象有三个不相同的交点,则实数b的取值范围是(  )

    A.(-2,-1)

    B.(-1,0)

    C.(0,1)

    D.(1,2)

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  • 6直线 y= a与函数 y= x 3-3 x的图象有三个相异的交点,则 a的取值范围为 (  )

    A.(-2,2)

    B.[-2,2]

    C.[2,+∞)

    D.(-∞,-2]

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  • 7已知函数 http://picflow.koolearn.com/upload/papers/20140824/201408240345098371193.png的单调递减区间是(0,4),则 http://picflow.koolearn.com/upload/papers/20140824/20140824034509852337.png=(   )

    A.3

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824034509868327.png

    C.2

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824034509884338.png

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  • 8已知函数 http://picflow.koolearn.com/upload/papers/20140824/20140824041532029495.png的导函数如图所示,若 http://picflow.koolearn.com/upload/papers/20140824/20140824041532045544.png为锐角三角形,则下列不等式一定成立的是(   ) http://picflow.koolearn.com/upload/papers/20140824/201408240415320606486.png

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824041532076868.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824041532092923.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824041532107847.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824041532123916.png

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  • 9已知定义在 http://picflow.koolearn.com/upload/papers/20140824/20140824035807186303.png上的函数 http://picflow.koolearn.com/upload/papers/20140824/20140824035807202447.png,其导函数 http://picflow.koolearn.com/upload/papers/20140824/20140824035807217481.png的图像如图所示,则下列叙述正确的是(   ) http://picflow.koolearn.com/upload/papers/20140824/201408240358072335103.png

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824035807264791.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824035807280741.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824035807295754.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824035807311761.png

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  • 10设函数f(x)的定义域为R,x 0(x 0≠0)是f(x)的极大值点,以下结论一定正确的是(  )

    A.?x∈R,f(x)≤f(x0)

    B.-x0是f(-x)的极小值点

    C.-x0是-f(x)的极小值点

    D.-x0是-f(-x)的极小值点

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