设f(x) 可导,且f(1)=0 ,则lim x趋向与1时f(x)/x-1=( )
人气：346 ℃ 时间：2020-04-21 16:43:51
解答
lim (x->1) f(x)/(x-1)
= lim (x->1) [ f(x) - f(1)] /(x-1)
= f '(1)
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