f(x)在xo处可导,f(xo)=0,则limnf(xo-1/n)等于
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f(x)在xo处可导,f(xo)=0,则limnf(xo-1/n)等于
f(x)在xo处可导,f(xo)=0,则limnf(xo-1/n)等于
f(x)在xo处可导,f(xo)=0,则limnf(xo-1/n)等于
lim nf(x0-1/n)
=lim [f(x0-1/n)-f(x0)]/(1/n)
=-lim [f(x0-1/n)-f(x0)]/(-1/n)
=-f'(x0)