约分 题目-(x+y)(x-y)^2 /(y+x)(y^2-x^2)

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约分题目-(x+y)(x-y)^2/(y+x)(y^2-x^2)约分题目-(x+y)(x-y)^2/(y+x)(y^2-x^2)约分题目-(x+y)(x-y)^2/(y+x)(y^2-x^2)-(x+

约分 题目-(x+y)(x-y)^2 /(y+x)(y^2-x^2)
约分 题目
-(x+y)(x-y)^2 /(y+x)(y^2-x^2)

约分 题目-(x+y)(x-y)^2 /(y+x)(y^2-x^2)
-(x+y)(x-y)^2 /(y+x)(y^2-x^2)
=(x-y)^2/(x-y)(x+y)
=(x-y)/(x+y)

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