计算(-x-y)(y-x)+(-x-y)(x+y),
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计算(-x-y)(y-x)+(-x-y)(x+y),计算(-x-y)(y-x)+(-x-y)(x+y),计算(-x-y)(y-x)+(-x-y)(x+y),提取公因式(-X-Y)(Y-X+X+Y)=(
计算(-x-y)(y-x)+(-x-y)(x+y),
计算(-x-y)(y-x)+(-x-y)(x+y),
计算(-x-y)(y-x)+(-x-y)(x+y),
提取公因式
(-X-Y)(Y-X+X+Y)
=(-x-y)2y
=-2xy-2y^2
计算(-x-y)(y-x)+(-x-y)(x+y),
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