limx->0 f(x)/x=0 f(0)=0

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limx->0 f(x)/x=0 f(0)=0

limx->0 f(x)/x=0 f(0)=0
limx->0 f(x)/x=0 f(0)=0

limx->0 f(x)/x=0 f(0)=0
limx->0 f(x)/x=0 f(0)=0
所以
limx->0 [f(x)-f(0)]/x=0= f'(0)