f(x)
=x^2 .sin(1/x) ; x≠0
=0 ; x=0
lim(x->0) f(x)
=lim(x->0) x^2.sin(1/x)
=0
=f(0)
x=0 , f(x) 连续
f'(0)
=lim(h->0) [f(h)- f(0)] /h
=lim(h->0) h.sin(1/h)
=0
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024