约分:y-x/x²-y²

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约分:y-x/x²-y²约分:y-x/x²-y²约分:y-x/x²-y²y-x/x²-y²=y-x/(x+y)(x-y)

约分:y-x/x²-y²
约分:y-x/x²-y²

约分:y-x/x²-y²
y-x/x²-y²
=y-x/(x+y)(x-y)
=-1/x+y

-1\(x+y)