(-x-y)(-x+y)-(x-y)(x-y)
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(-x-y)(-x+y)-(x-y)(x-y)
=[(-x)²-y²]-(x²-2xy+y²)
=x²-y²-x²+2xy-y²
=2xy-2y²
=[(-x)²-y²]-(x²-2xy+y²)
=x²-y²-x²+2xy-y²
=2xy-2y²
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化简的话:
(-x-y)(-x+y)-(x-y)(x-y)
=(-x)²-y²-(x²-2xy+y²)
=x²-y²-x²+2xy-y²
=2xy-2y²
=2y(x-y)
(-x-y)(-x+y)-(x-y)(x-y)
=(-x)²-y²-(x²-2xy+y²)
=x²-y²-x²+2xy-y²
=2xy-2y²
=2y(x-y)
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展开全部
(-x-y)(-x+y)-(x-y)(x-y)
=(-x)²-y²-(x²-2xy+y²)
=x²-y²-x²+2xy-y²
=2xy-2y²
=(-x)²-y²-(x²-2xy+y²)
=x²-y²-x²+2xy-y²
=2xy-2y²
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评论
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