一道分式计算题.x/(x-1)减X/(x+1)

问题描述:

一道分式计算题.
x/(x-1)减X/(x+1)

x/(x-1)-X/(x+1)
=【x(x+1)-x(x-1)】/【(x+1)(x-1)】
=(x²+x-x²+x)/【(x+1)(x-1)】
=2x/【(x-1)(x+1)】