(-x-y)(y-x)+(-x-y)(x+y)和若a²+b²=10,a-b=2,求ab的值

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(-x-y)(y-x)+(-x-y)(x+y)和若a²+b²=10,a-b=2,求ab的值

1 (-x-y)2y -2y²-2xy
2 (a-b)²=4 a²+b²=10 10-2ab=4 ab=3

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