已知.X²-XY=21,XY-Y²=-12,求X²-Y²与X²-2XY+Y²的值.
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已知.X²-XY=21,XY-Y²=-12,求X²-Y²与X²-2XY+Y²的值.
已知.X²-XY=21,XY-Y²=-12,求X²-Y²与X²-2XY+Y²的值.
已知.X²-XY=21,XY-Y²=-12,求X²-Y²与X²-2XY+Y²的值.
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已知.X²-XY=21,XY-Y²=-12,求X²-Y²与X²-2XY+Y²的值.
已知.X²-XY=21,XY-Y²=-12,求X²-Y²与X²-2XY+Y²的值.
已知.X²-XY=21,XY-Y²=-12,求X²-Y²与X²-2XY+Y²的值.
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