题目内容
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[主观题]
设f(x)可导且f(x)≠0,证明:曲线y=f(x)与y=f(x)sinx在交点处相切
设f(x)可导且f(x)≠0,证明:曲线y=f(x)与y=f(x)sinx在交点处相切
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设f(x)可导且f(x)≠0,证明:曲线y=f(x)与y=f(x)sinx在交点处相切
设f(x)∈C[a,b],在(a,b)内可导,且曲线y=f(x)非直线,证明:存在ξ∈(a,b),使得。
设函数f(x),ψ(x)二阶可导,当x>0时,f"(x)>ψ"(x),且f(0)=ψ(0),f'(0)=ψ'(0),证明:当x>0时,f(x)>ψ(x)
设函数f(x)在[0,a]上二阶可导,并有|f"(x)|≤M,且f(x)在(0,a)内取得最大值,证明
|f'(0)|+|f'(a)|≤Ma
(1)设f(x)在[0,+∞)上连续,可导,且证明:存在c∈(0,+∞),使
f'(c)=0
设函数f(x)在[a,+∞)上二阶可导,且f(x)在[a,+∞)上的图形是凸的,f(a)=A>0,f'(a)<0,证明
设f(x)在[0,+∞)上连续,在(0,+∞)内可导且满足
f(0)=0,f(x)≥0,f(x)≥f'(x)(x>0),
证明:f(x)≡0.
设f(x)在[a,b]上连续,在(a,b)内可导且f'(x)≤0,
.
证明在(a,b)内有F'(x)≤0.
设f(x)在[a,b]上连续,在(a,b)内可导且f'(x)≤0,,证明在(a,b)内有F'(x)≤0.
设f(x)在[0,+∞)上连续,在(0,+∞)内可导且满足
f(0)=0, f(x)≥0,f(x)≥f'(x)(x>0),
证明:f(x)0.