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设f(x)为可微函数,f(0)=0.令则=().
设f(x)为可微函数,f(0)=0.令则=().
设f(x)为可微函数,f(0)=0.令则
=().
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设f(x)为可微函数,f(0)=0.令则
=().
设函数f(x)在闭区间[a,b]上可微分,且f(a)=f(b)=0.证明:若导数f'(x)在区间[a,b]上不恒等于0
设函数f(x)在闭区间[a,b]上可微分,且f(a)=f(b)=0.证明:若导数f'(x)在区间[a,b]上不恒等于0,则至少有一点ξ∈(a,b),使
设f(x)满足其中g(x)为任一函数,证明:若f(xn)=f(x1)=0(x0<x1),则f在[x0,x3]上恒等于0.
A.fx(x,y)和fy(x,y)在(0,0)点连续
B.连续,但不可偏导
C.可偏导,但不连续
D.可微且df|(0,0)=0
设函数f(x)在闭区间[a,b]上连续,而在开区间(a,b)内可微分且f(a)=0.若有正常数K,使
证明:f(x)=0(a≤x≤b).
设函数f(x)在[0,1]上连续,在(0,1)内可导,且f(0),证明在(0,1)内至少存在一点ξ∈使f'(ξ)=0.