通分 2X+2Y分之X-Y与(X+Y)²分之XY
问题描述：
通分 2X+2Y分之X-Y与(X+Y)²分之XY
答
最简公分母是2(x+y)²
(x-y)/2x+2y=(x-y)/2(x+y)=(x-y)(x+y)/2(x+y)²
xy/(x+y)²=2×xy/2(x+y)²=2xy/2(x+y)²