把整式的通分说清楚一下就是那个 2xy x—————与 -------- (x+y)(x+y) x*x-y*y再讲一下怎样通分,学要注意的地方分母很麻烦的怎么通分

把整式的通分说清楚一下
就是那个 2xy x
—————与 --------
(x+y)(x+y) x*x-y*y
再讲一下怎样通分,学要注意的地方
分母很麻烦的怎么通分

2xy/(x+y)^2
x/(x^2-y^2)=x/(x+y)(x-y)
所以最简公分母是(x+y)^2(x-y)
所以
2xy/(x+y)^2
=2xy(x-y)/(x+y)^2(x-y)
=(2x^2y-2xy^2)/(x+y)^2(x-y)
x/(x+y)(x-y)
=x(x+y)/(x+y)^2(x-y)
=(x^2+xy)/(x+y)^2(x-y)