通分:x-y/2x+2y与xy/(x+y)^2 ，2mn/4m^2-9与2m-3/2m+3
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解决时间 2021-01-10 05:01
- 提问者网友：ミ烙印ゝ
- 2021-01-09 11:11
通分:x-y/2x+2y与xy/(x+y)^2 ，2mn/4m^2-9与2m-3/2m+3
最佳答案
- 五星知识达人网友：撞了怀
- 2021-01-09 11:47
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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