2x+2y=2(x+y)
所以最简公分母是2(x+y)²
所以
(x-y)/(2x+2y)=(x+y)(x-y)/[2(x+y)²]
(xy)/（x+y）²=2xy/[2(x+y)²]
(x-y)/(2x+2y)与(xy)/（x+y）²通分要过程
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