设函数f(x)在x=1处可导,且f'(1)=2,则[lim(h→0)f(1-h)-f(1)]/h等于
人气：449 ℃ 时间：2019-08-19 00:55:46
解答
lim(h→0) (f(1-h)-f(1))/h
=-lim (f(1-h)-f(1))/(-h)
根据导数的定义,
=-f'(1)
=-2
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