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解：最简公分母是.........x-y/2x+2y=............xy/（x+y）^2=...............
格式：例如：x-y/2x+2y与xy/(x+y)^2
解：最简公分母是.........
x-y/2x+2y=............
xy/（x+y）^2=............ 展开
解：最简公分母是.........
x-y/2x+2y=............
xy/（x+y）^2=............ 展开
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解：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............
解：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)
x-y/2x+2y=(x+y)(x-y)/2(x+y)²............
xy/（x+y）^2=2xy/2(x+y)²............
解：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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