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函数 http://picflow.koolearn.com/upload/papers/20140824/20140824050724593641.png在区间 http://picflow.koolearn.com/upload/papers/20140824/20140824050724609419.png上(    )

发布时间:2021-07-16

A.有最大值,但无最小值

B.有最大值,也有最小值

C.无最大值,但有最小值

D.既无最大值,也无最小值.

试卷相关题目

  • 1设函数f(x)满足x 2f′(x)+2xf(x)= http://picflow.koolearn.com/upload/papers/20140824/20140824050519871422.png,f(2)= http://picflow.koolearn.com/upload/papers/20140824/20140824050519887451.png,则x>0时,f(x)(  )

    A.有极大值,无极小值

    B.有极小值,无极大值

    C.既有极大值又有极小值

    D.既无极大值也无极小值

    开始考试点击查看答案
  • 2函数f(x)=1+x- http://picflow.koolearn.com/upload/papers/20140824/20140824052549450403.png在(0,2π)上是(  )

    A.增函数

    B.在(0,π)上递增,在(π,2π)上递减

    C.减函数

    D.在(0,π)上递减,在(0,2π)上递增

    开始考试点击查看答案
  • 3函数 http://picflow.koolearn.com/upload/papers/20140824/20140824052909536738.png的递增区间是(    )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824052909551581.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824052909567816.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824052909598613.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824052909614790.png

    开始考试点击查看答案
  • 4若函数 http://picflow.koolearn.com/upload/papers/20140824/20140824052621742847.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824052621757514.png上单调递减,则实数 http://picflow.koolearn.com/upload/papers/20140824/20140824052621773311.png的取值范围为(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824052621789437.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824052621804413.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824052621820446.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824052621835447.png

    开始考试点击查看答案
  • 5设f(x)=- http://picflow.koolearn.com/upload/papers/20140824/20140824052727012327.pngx 3+ http://picflow.koolearn.com/upload/papers/20140824/20140824052727028338.pngx 2+2ax,若f(x)在( http://picflow.koolearn.com/upload/papers/20140824/20140824052727059382.png,+∞)上存在单调递增区间,则实数a的取值范围为(  )

    A.a>-http://picflow.koolearn.com/upload/papers/20140824/20140824052727075330.png

    B.a<-http://picflow.koolearn.com/upload/papers/20140824/20140824052727075330.png

    C.a>http://picflow.koolearn.com/upload/papers/20140824/20140824052727075330.png

    D.不存在

    开始考试点击查看答案
  • 6f(x)=x 3﹣3x 2+2在区间[﹣1,1]上的最大值是(  )

    A.﹣2

    B.1

    C.2

    D.4

    开始考试点击查看答案
  • 7函数 http://picflow.koolearn.com/upload/papers/20140824/20140824052619948861.png在区间 http://picflow.koolearn.com/upload/papers/20140824/20140824052619963330.png上的最大值是(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824052619979304.png

    B.1

    C.2

    D.4

    开始考试点击查看答案
  • 8若函数f(x)=2x 2-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.[1,http://picflow.koolearn.com/upload/papers/20140824/20140824052726747388.png)

    C.[1,2)

    D.[http://picflow.koolearn.com/upload/papers/20140824/20140824052726747388.png,2)

    开始考试点击查看答案
  • 9函数f(x)=x 3+ax 2+3x﹣9,已知f(x)在x=﹣3时取得极值,则a=(  )

    A.2

    B.3

    C.4

    D.5

    开始考试点击查看答案
  • 10若函数y=f(x)在R上可导,且满足不等式xf′(x)>-f(x)恒成立,且常数a,b满足a>b,则下列不等式一定成立的是 (  )

    A.af(b)>bf(a)

    B.af(a)>bf(b)

    C.af(a)

    D.af(b)开始考试点击查看答案

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