f(x)=f(0)+x+a(x),lim(x~0)a(x)/x=0,f `(0)=?

问题描述:

f(x)=f(0)+x+a(x),lim(x~0)a(x)/x=0,f `(0)=?

f'(0)=lim(x~0)[(f(x)-f(0))/x]
=lim(x~0)[(x+a(x))/x]
=1+lim(x~0)a(x)/x
=1