求过程,我错哪了?
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[x^2/(x-y)]-(x+y)
=[x^2/(x-y)]-[(x+y)(x-y)/(x-y)]
==[x^2-(x+y)(x-y)]/(x-y)
=[x^2-(x^2-y^2)]/(x-y)
=y^2/(x-y)
=[x^2/(x-y)]-[(x+y)(x-y)/(x-y)]
==[x^2-(x+y)(x-y)]/(x-y)
=[x^2-(x^2-y^2)]/(x-y)
=y^2/(x-y)
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