通分:x-y/2x+2y与xy/(x+y)^2 ,2mn/4m^2-9与2m-3/2m+3

题目

通分:x-y/2x+2y与xy/(x+y)^2 ,2mn/4m^2-9与2m-3/2m+3
格式：例如：x-y/2x+2y与xy/(x+y)^2
最简公分母是.
x-y/2x+2y=.
xy/（x+y）^2=.

答案

最简公分母是2(x+y)²x-y/2x+2y=(x+y)(x-y)/2(x+y)².xy/（x+y）^2=2xy/2(x+y)².最简公分母是(m+3)(2m-3)2mn/4m^2-9=2mn/(2m+3)(2m-3)2m-3/2m+3=(2m-3)²/(2m+3)(2m-3)