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已知函数在x
0
处可导,且
https://assets.asklib.com/psource/2015102817263942752.jpg
{x/[f(x
0
-2x)-f(x
0
)]}=1/4,则f′(x
0
)的值为:()
A . 4
B . -4
C . -2
D . 2
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设函数,要使f(x)在点x=1处连续,则a的值是()。
A . -2
B . -1
C . 0
D . 1
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设函数f(x)可导,且https://assets.asklib.com/source/1464941809822009950.gif=0,则X。一定是函数的( ).
A . 极大值点
B . 极小值点
C . 驻点
D . 拐点
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设二阶可导函数f(x)>0,若曲线
https://assets.asklib.com/psource/2015122210245181173.jpg
有拐点(1,2),且f′(1)=12,则f″(1)=()。
A . 0
B . 8
C . 18
D . 36
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设函数f(x
0
)在x处可导,则
https://assets.asklib.com/psource/2016030417262288150.jpg
(),
A . -f′(x
)
B . f′(-x
)
C . f′(x
)
D . 2f′(x
)
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设函数
https://assets.asklib.com/psource/2015110315272126117.png
,若,f(x)在点x=1处连续而且可导,则k的值是:()
A . 2
B . -2
C . -1
D . 1
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若函数f(x)在x0的某邻域内处处可导,且f’(x0)=0,则函数f(x)必在x0处取得极值.
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设函数f(x)在x0处可导,则f(x0)=().
A.<img src='https://img2.soutiyun.com/ask/uploadfile/9075001-9078000/a49ddcdd8d83aff8.jpg' />
B.<img src='https://img2.soutiyun.com/ask/uploadfile/9075001-9078000/216866bae960f5f8.jpg' />
C.<img src='https://img2.soutiyun.com/ask/uploadfile/9075001-9078000/8ed18986100caff8.jpg' />
D.<img src='https://img2.soutiyun.com/ask/uploadfile/9075001-9078000/1679be095d4e67f8.jpg' />
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设函数f(x)二阶连续可导,且f(0)=0,f'(0)=1,求
设函数f(x)二阶连续可导,且f(0)=0,f'(0)=1,求<img src='https://img2.soutiyun.com/ask/2020-12-08/976282425721188.png' />
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证明:若函数f(x)在[0,1]可导,且f(0)=0,有|f´(x)|≤|f(x)|,则f(x)=0,x∈[0,1].
证明:若函数f(x)在[0,1]可导,且f(0)=0,<img src='https://img2.soutiyun.com/ask/2020-11-11/973975609415542.png' />有|f´(x)|≤|f(x)|,则f(x)=0,x∈[0,1].
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设I为一无穷区间,函数f(x)在I上连续,I内可导,试证明:如果在I的任一有限的子区间上,f'(x)≥0(或f'(x)≤0),且等号仅在有限多个点处成立,那么f(x)在区间I上单调增加(或单调减少).
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设函数f(x)满足f(0)=0.证明f(x)在x=0处可导的充分必要条件是:存在在x=0处连续的函数g(x),使得f(x)=xg(x),且此时成立f(0)=g(0).
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设f(x)为可导的奇函数,且f‘(x0)=a,则f’(-x0)=()
A.a
B.-a
C.|a|
D.0
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设f(x)二阶连续可导,且,则()。
设f(x)二阶连续可导,且<img src='https://img2.soutiyun.com/ask/2020-12-04/975952141695317.jpg' />,则()。
A.f(0)是f(x)的极小值
B.f(0)是f(x)的极大值
C.(0,f(0))是曲线y=f(x)的拐点
D.x=0是f(x)的驻点但不是极值点
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设函数其中g(x)有二阶连续导函数,且g(0)=1.(1)确定a的值,使f(x)在点x=0处连续;(2)求f'(x)
设函数<img src='https://img2.soutiyun.com/ask/2020-08-18/96660742963403.png' />其中g(x)有二阶连续导函数,且g(0)=1.
(1)确定a的值,使f(x)在点x=0处连续;
(2)求f'(x);
(3)讨论f'(x)在点x=0处的连续性.
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设函数f(x)一阶连续可导.且f(0)=f&39;(0)=1,则<img src="https://img2.soutiyun.com/ask/2020-12-11/976544786128219.png"/>=().
A.1
B.-1
C.0
D.∞
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设函数f(x)在[0,1]上连续,在(0,1)内可导,且证明在(0,1)内存在一点ξ,使f'(ξ)=0。
设函数f(x)在[0,1]上连续,在(0,1)内可导,且<img src='https://img2.soutiyun.com/ask/2020-08-07/965639441738848.png' />证明在(0,1)内存在一点ξ,使f'(ξ)=0。
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设函数[图],要使f(x)在x=0处连续,则a的值是:()A. 0B. ...
设函数<img src='https://img2.soutiyun.com/shangxueba/ask/19011001-19014000/19013158/2015110315195516320.png' />,要使f(x)在x=0处连续,则a的值是:()
A.0
B. 1
C. -1
D. λ
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设函数f(x)可导,且f(x)=0,则x一定是函数的()。
A.极大值点
B.极小值点
C.驻点
D.拐点
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设函数f在点x=1处二阶可导,证明:若f'(1)=0,f"(1)=0,则在x=1处有
设函数f在点x=1处二阶可导,证明:若f'(1)=0,f"(1)=0,则在x=1处有<img src='https://img2.soutiyun.com/ask/2020-11-28/975441569605878.png' />
<img src='https://img2.soutiyun.com/ask/2020-11-28/97544157767434.png' />
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设(1)证明f(x)在[0,+∞)上可导,且一致连续;(2)证明反常积分发散。
设<img src='https://img2.soutiyun.com/ask/2021-01-28/980692750486118.png' />
(1)证明f(x)在[0,+∞)上可导,且一致连续;
(2)证明反常积分<img src='https://img2.soutiyun.com/ask/2021-01-28/980692795149672.png' />发散。
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证明:(1)若函数f在[a,b]上可导,且f'(x)≥m,则(2)若函数f在[a,b]上可导,且(3)对任意实数x<sub>1
证明:(1)若函数f在[a,b]上可导,且f'(x)≥m,则
<img src='https://img2.soutiyun.com/ask/2021-02-04/98128598322409.png' />
(2)若函数f在[a,b]上可导,且
<img src='https://img2.soutiyun.com/ask/2021-02-04/981285989538451.png' />
(3)对任意实数x<sub>1</sub>,x<sub>2</sub>,都有
<img src='https://img2.soutiyun.com/ask/2021-02-04/981286001647143.png' />
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设函数f(x)在[01]上二阶可导,且f"(x)≤0,x∈[0,1],证明:
设函数f(x)在[01]上二阶可导,且f"(x)≤0,x∈[0,1],证明:
<img src='https://img2.soutiyun.com/ask/2020-12-16/976976979900419.png' />
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设f(x)在[0,1]上连续且单调递减,则函数在(0,1)内().A.单调增加B.单调减少C.有极大值D.有极小
设f(x)在[0,1]上连续且单调递减,则函数<img src='https://img2.soutiyun.com/ask/2020-12-11/976547106148916.png' />在(0,1)内().
A.单调增加
B.单调减少
C.有极大值
D.有极小值