化简:(x+y^-1)(x-y^-1)(x^2+y^-2)
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(x+y)(x-y)+4(y-1)
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[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
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y'/y=1/x
x^/y-x-y^/y-x化简.
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