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=.

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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=.

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=.
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=.

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=.
最简公分母是2(x+y)²
x-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)

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