假设我们要求f(g(x))对x的导数,且f(g(x))和g(x)均可导.首先,根据定义：当h->0时,g'(x)=lim(g(x+h)-g(x))/h,所以,当h->0时,lim(g(x+h)-g(x))/h-g'(x)->0设v=(g(x+h)-g(x))/h-g'(x)就有：g(x+h)=g(x)+(g'(x)+v)h同理：...