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若函数f(x)=2x2﹣lnx在其定义域内的一个子区间(k﹣1,k+1)内不是单调函数,则实数k的取值范围是 

发布时间:2021-07-15

A.[1,+∞)

B.http://picflow.koolearn.com/upload/papers/g02/20120919/201209191607288931355.png

C.[1,2)

D.http://picflow.koolearn.com/upload/papers/g02/20120919/201209191607290201459.png

试卷相关题目

  • 1若函数f(x)=2x2﹣lnx在其定义域内的一个子区间(k﹣1,k+1)内不是单调函数,则实数k的取值范围是

    A.[1,+∞)

    B.http://picflow.koolearn.com/upload/papers/g02/20120920/201209201717276181101.png

    C.[1,2)

    D.http://picflow.koolearn.com/upload/papers/g02/20120920/201209201717277421142.png

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  • 2已知定义在R上的函数f(x)满足f(2)=1,f′(x)为f(x)的导函数.已知y=f′(x)的图象如图所示,若两个正数a,b满足f(2a+b)>1,则http://picflow.koolearn.com/upload/papers/g02/20120924/20120924165650540996.png的取值范围是http://picflow.koolearn.com/upload/papers/g02/20120924/201209241656516835802.png

    A.(http://picflow.koolearn.com/upload/papers/g02/20120924/201209241656523301232.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120924/201209241656531982429.png

    C.(﹣2,1)

    D.(﹣∞,﹣2)∪(1,+∞)

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  • 3函数http://picflow.koolearn.com/upload/papers/g02/20120927/201209272300570891653.png的单调递减区间为    

    A.http://picflow.koolearn.com/upload/papers/g02/20120927/201209272300579081205.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120927/201209272300587541545.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120927/201209272300595861629.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120927/201209272301004341162.png

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  • 4若f(x)=﹣x2+2ax与g(x)= http://picflow.koolearn.com/upload/papers/g02/20120905/20120905100946724299.png在区间[1,2]上都是减函数,则a的取值范围是   

    A.(0,1)

    B.(0,1]

    C.(﹣1,0)∪(0,1)

    D.(﹣1,0)∪(0,1 ]

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  • 5设f(x)是一个多项式函数,在[a,b]上下列说法正确的是(  )

    A.f(x)的极值点一定是最值点

    B.f(x)的最值点一定是极值点

    C.f(x)在[a,b]上可能没有极值点

    D.f(x)在[a,b]上可能没有最值点

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  • 6已知函数http://picflow.koolearn.com/upload/papers/g02/20120918/201209181142558803988.png,使得佂x1∈[1,2],都有f(x1)<f(x0),则实数a的取值范围是

    A.(0,1)

    B.(1,2)

    C.(2,+∞)

    D.(0,1)∪(2,+∞)

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  • 7已知定义在R上的函数http://picflow.koolearn.com/upload/papers/g02/20120927/20120927220711677874.png满足http://picflow.koolearn.com/upload/papers/g02/20120927/201209272207133581693.pnghttp://picflow.koolearn.com/upload/papers/g02/20120927/20120927220714304874.png的导函数。已知http://picflow.koolearn.com/upload/papers/g02/20120927/201209272207153191194.png的图象如图所示,若两个正数http://picflow.koolearn.com/upload/papers/g02/20120927/20120927220716283711.png满足http://picflow.koolearn.com/upload/papers/g02/20120927/201209272207172751547.png,则http://picflow.koolearn.com/upload/papers/g02/20120927/201209272207188021019.png的取值范围是http://picflow.koolearn.com/upload/papers/g02/20120927/201209272207200558369.png

    A.http://picflow.koolearn.com/upload/papers/g02/20120927/201209272207213071278.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120927/201209272207223452182.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120927/20120927220723353902.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120927/201209272207244041699.png

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  • 8数f(x)的图象如图所示,下列数值排序正确的是 http://picflow.koolearn.com/upload/papers/g02/20120923/201209231526396814654.png

    A.0<f′(2)<f′(3)<f(3)﹣f(2)

    B.0<f′(3)<f(3)﹣f(2)<f′(2)

    C.0<f(3)<f′(2)<f(3)﹣f(2)

    D.0<f(3)﹣f(2)<f′(2)<f′(3)

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  • 9若在区间(a,b)内有f′(x)>0且f(a)≥0,则在(a,b)内有(  )

    A.f(x)>0

    B.f(x)<0

    C.f(x)=0

    D.不能确定

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  • 10若函数f(x)在区间(a,b)内函数的导数为正,且f(b)≤0,则函数f(x)在(a,b)内有(  )

    A.f(x)>0

    B.f(x)<0

    C.f(x)=0

    D.无法确定

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