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若a>0,b>0,且函数f(x)=4x 3-ax 2-2bx-2在x=1处有极值,则ab的最大值为(  )

发布时间:2021-07-16

A.2

B.3

C.6

D.9

试卷相关题目

  • 1函数f(x)=x 2-2ax+a在区间(-∞,1)上有最小值,则函数g(x)= http://picflow.koolearn.com/upload/papers/20140824/20140824052729618547.png在区间(1,+∞)上一定(  )

    A.有最小值

    B.有最大值

    C.是减函数

    D.是增函数

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  • 2设三次函数 http://picflow.koolearn.com/upload/papers/20140824/20140824052808025478.png的导函数为 http://picflow.koolearn.com/upload/papers/20140824/20140824052808040479.png,函数 http://picflow.koolearn.com/upload/papers/20140824/20140824052808056618.png的图象的一部分如下图所示,则(     ) http://picflow.koolearn.com/upload/papers/20140824/201408240528080722529.png

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824052808025478.png极大值为http://picflow.koolearn.com/upload/papers/20140824/20140824052808103523.png,极小值为http://picflow.koolearn.com/upload/papers/20140824/20140824052808118541.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824052808025478.png极大值为http://picflow.koolearn.com/upload/papers/20140824/20140824052808118541.png,极小值为http://picflow.koolearn.com/upload/papers/20140824/20140824052808103523.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824052808025478.png极大值为http://picflow.koolearn.com/upload/papers/20140824/20140824052808212484.png,极小值为http://picflow.koolearn.com/upload/papers/20140824/20140824052808228469.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824052808025478.png极大值为http://picflow.koolearn.com/upload/papers/20140824/20140824052808228469.png,极小值为http://picflow.koolearn.com/upload/papers/20140824/20140824052808212484.png

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  • 3函数f(x)的定义域为R,f(-1)=2,对任意x∈R,f′(x)>2,则f(x)>2x+4的解集为(    )

    A.(-1,1)

    B.(-1,+∞)

    C.(-∞,-1)

    D.(-∞,+∞)

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  • 4已知 http://picflow.koolearn.com/upload/papers/20140824/20140824050128507601.png都是定义在 http://picflow.koolearn.com/upload/papers/20140824/20140824050128538279.png上的函数, http://picflow.koolearn.com/upload/papers/20140824/20140824050128554531.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824050128570760.png,且 http://picflow.koolearn.com/upload/papers/20140824/20140824050128585665.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824050128601585.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824050128616996.png,对于数列 http://picflow.koolearn.com/upload/papers/20140824/201408240501286321015.png,任取正整数 http://picflow.koolearn.com/upload/papers/20140824/20140824050128648591.png,则前k项和大于 http://picflow.koolearn.com/upload/papers/20140824/20140824050128663420.png的概率是(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824050128679414.png  

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824050128694370.png  

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824050128726338.png   

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824050128757369.png

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  • 5设函数f(x)=x-2msin x+(2m-1)sin xcos x(m为实数)在(0,π)上为增函数,则m的取值范围为(  )

    A.[0,http://picflow.koolearn.com/upload/papers/20140824/20140824045802072382.png]

    B.(0,http://picflow.koolearn.com/upload/papers/20140824/20140824045802072382.png)

    C.(0,http://picflow.koolearn.com/upload/papers/20140824/20140824045802072382.png]

    D.[0,http://picflow.koolearn.com/upload/papers/20140824/20140824045802072382.png)

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  • 6若函数 http://picflow.koolearn.com/upload/papers/20140824/201408240457345381534.png有两个零点,则 http://picflow.koolearn.com/upload/papers/20140824/20140824045734569337.png的取值范围(  )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824045734585494.png 

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824045734585485.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824045734600570.png   

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824045734616542.png

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  • 7已知 http://picflow.koolearn.com/upload/papers/20140824/20140824050334368447.png是可导的函数,且 http://picflow.koolearn.com/upload/papers/20140824/20140824050334399591.png对于 http://picflow.koolearn.com/upload/papers/20140824/20140824050334415433.png恒成立,则(     )

    A.http://picflow.koolearn.com/upload/papers/20140824/201408240503344311183.png

    B.http://picflow.koolearn.com/upload/papers/20140824/201408240503344461197.png

    C.http://picflow.koolearn.com/upload/papers/20140824/201408240503345241203.png

    D.http://picflow.koolearn.com/upload/papers/20140824/201408240503345401213.png

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  • 8设函数 http://picflow.koolearn.com/upload/papers/20140824/20140824044057712845.png有两个极值点 http://picflow.koolearn.com/upload/papers/20140824/20140824044057727423.png,且 http://picflow.koolearn.com/upload/papers/20140824/20140824044057743536.png, http://picflow.koolearn.com/upload/papers/20140824/20140824044057759555.png,则( )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824044057790800.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824044057805771.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824044057821796.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824044057837818.png

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  • 9已知函数 http://picflow.koolearn.com/upload/papers/20140824/20140824045051979805.png在区间[-1,2]上是减函数,那么b+c(    )

    A.有最大值http://picflow.koolearn.com/upload/papers/20140824/20140824045051979401.png

    B.有最大值-http://picflow.koolearn.com/upload/papers/20140824/20140824045051979401.png

    C.有最小值http://picflow.koolearn.com/upload/papers/20140824/20140824045051979401.png

    D.有最小值-http://picflow.koolearn.com/upload/papers/20140824/20140824045051979401.png

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  • 10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

    开始考试点击查看答案
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