39.设f(x)在[0,1]上连续,在(0,1)内可导,且 f(0)=0 ,(dfrac (1)(2))=2, (1)=dfrac (1)(2),-|||-(1)证明:存在 in (0,1), 使得 f(c)=c-|||-(2)证明:存在 in in (0,1), 使得 '(xi )+f(xi )=1+xi -|||-微信公众号: