把整式的通分说清楚一下就是那个2xyx—————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

Question

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

Answer 1

2xy/(x+y)^2x/(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)