设f(0)=0,f'(0)存在,求lim(x→o)f（x）/x.

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设f(0)=0,f'(0)存在,求lim(x→o)f（x）/x.
设f(0)=0,f'(0)存在,求lim(x→o)f（x）/x.

设f(0)=0,f'(0)存在,求lim(x→o)f（x）/x.
因为f(0)=0,f'(0)；所以 lim(x→0)f(x)/x=lim(x→0)[f(x)-f(0)]/(x-0)=f'(0)