lim [f(x0+h)-f(x0-h)]/h = 2 lim [f(x0+h)-f(x0-h)]/2h = 2 f'(x0)这个我还是不懂

问题描述:

lim [f(x0+h)-f(x0-h)]/h = 2 lim [f(x0+h)-f(x0-h)]/2h = 2 f'(x0)这个我还是不懂