约分 -(x+y)(x-y)^2/(y+x)(y^2-x^2)
1个回答
-(x+y)(x-y)^2/(y+x)(y^2-x^2)
=-(x^2-y^2)(x-y)/(y+x)(y^2-x^2)
=(x-y)/(y+x)
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