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已知f(x)在x=0处可导,且f(0)=0,则limx→0x2f(x)−2f(x3)x3=()A.-2f′(0)B.-f′(0)C.f′(0)D.0

题目详情
已知f(x)在x=0处可导,且f(0)=0,则
lim
x→0
x2f(x)−2f(x3)
x3
=(  )
A. -2f′(0)
B. -f′(0)
C. f′(0)
D. 0
▼优质解答
答案和解析

lim
x→0
x2f(x)−2f(x3)
x3
lim
x→0
[
f(x)−f(0)
x
−2
f(x3)−f(0)
x3
]
因为f(x)在x=0处可导,故原式=-f'(0)
故选:B.