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1.(x²+y²-2xy)-x+y
=(x-y)²-(x-y)
=(x-y)(x-y-1)
2.(x²+y²+2xy)²-(x²-2xy+y²)²
=(x²+y²+2xy+x²-2xy+y²)(x²+y²+2xy-x²+2xy-y²)
=2(x²+y²)*4xy
=8xy(x²+y²)
=(x-y)²-(x-y)
=(x-y)(x-y-1)
2.(x²+y²+2xy)²-(x²-2xy+y²)²
=(x²+y²+2xy+x²-2xy+y²)(x²+y²+2xy-x²+2xy-y²)
=2(x²+y²)*4xy
=8xy(x²+y²)
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展开全部
(x²+y²-2xy)-x+y
=(x-y)²-(x-y)
=(x-y-1)(x-y)
(x²+y²+2xy)²-(x²-2xy+y²)²
=(x²+y²+2xy+x²-2xy+y²)(x²+2xy+y²-x²+2xy-y²)
=4xy(2x²+2y²)
=8xy(x²+y²)
=(x-y)²-(x-y)
=(x-y-1)(x-y)
(x²+y²+2xy)²-(x²-2xy+y²)²
=(x²+y²+2xy+x²-2xy+y²)(x²+2xy+y²-x²+2xy-y²)
=4xy(2x²+2y²)
=8xy(x²+y²)
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