4、已知m/x²-y²=2xy-y²/x²-y² +x-y/x+y,则m=_

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4、已知m/x²-y²=2xy-y²/x²-y² +x-y/x+y,则m=_
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4、已知m/x²-y²=2xy-y²/x²-y² +x-y/x+y,则m=_
4、已知m/x²-y²=2xy-y²/x²-y² +x-y/x+y,则m=_

4、已知m/x²-y²=2xy-y²/x²-y² +x-y/x+y,则m=_
m=1