一道数学通分题x-y/2x+2y与xy/(x+y)²
问题描述：
一道数学通分题
x-y/2x+2y与xy/(x+y)²
答
x-y/2x+2y
=(2x^2-y+2xy)/2x
=(2x^2-y+2xy)(x+y)^2/2x(x+y)^2
xy/(x+y)^2
=2x*xy/2x(x+y)^2