求导:y=x-1/x+1?
问题描述:
求导:y=x-1/x+1?
答
y'=[(x-1)'(x+1)-(x-1)(x+1)']/(x+1)^2=[x+1-x+1]/(x+1)^2=2/(x+1)^2
求导:y=x-1/x+1?
y'=[(x-1)'(x+1)-(x-1)(x+1)']/(x+1)^2=[x+1-x+1]/(x+1)^2=2/(x+1)^2