(x^2+y^2)/(x^2-y^2) 减去 (x+y)/(2x-2y) ,化简.我算出来的是:x^2-2xy+y^2,和别人的不一样,
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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x^2(x-y)+(y-x)
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化简:[(x+y)(x-y)(x+y)^2-2y(x-2y)](-2y) 谢谢!
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