2(x+y)(-x-y)-(2x+y)(-2x+y) 计算

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2(x+y)(-x-y)-(2x+y)(-2x+y)
=-2(x+y)²+(2x+y)(2x-y)
=-2(x²+2xy+y²)+(4x²-y²)
=-2x²-4xy-2y²+4x²-y²
=2x²-4xy-3y²
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