f'(x)=-2,求limf(x+h)-f(x-h)/h(h趋向于0)
f'(x)=-2,求limf(x+h)-f(x-h)/h(h趋向于0)
数学人气：529 ℃时间：2020-10-02 03:28:42
优质解答
lim[f(x＋h)－f(x－h)]/(2h)→f'(x),则：lim[f(x＋h)－f(x－h)]/h→2f'(x)=－4为什么lim[f(x＋h)－f(x－h)]/(2h)→f'(x)lim[f(x＋h)－f(x－h)]/[(x＋h)－(x－h)]→f'(x)
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