Y=X+1/X-1的导数y'=[(x+1)'(x-1)-(x-1)'(x+1)]/(x-1)²=[(x-1)-(x+1)]/(x-1)²=-2/(x-1)²我看百度网友的答案,我不明白【(x-1)'】和【(x+1)'】为什么要消失,我没听过这个

问题描述:

Y=X+1/X-1的导数
y'=[(x+1)'(x-1)-(x-1)'(x+1)]/(x-1)²
=[(x-1)-(x+1)]/(x-1)²
=-2/(x-1)²
我看百度网友的答案,我不明白【(x-1)'】和【(x+1)'】为什么要消失,我没听过这个