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(xy-1)²+(x+y-2)(x+y-2xy)
=(xy)²-2xy+1+(x+y)²-2(x+y)-2xy(x+y)+4xy
=(xy+1))²+(x+y)²-2(x+y)(xy+1)
=(xy+1-x-y)²
=(xy)²-2xy+1+(x+y)²-2(x+y)-2xy(x+y)+4xy
=(xy+1))²+(x+y)²-2(x+y)(xy+1)
=(xy+1-x-y)²
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展开全部
(xy-1)²+(x+y-2)(x+y-2xy)
=x²y²-2xy+1+(x+y)²-2xy(x+y)-2(x+y)+4xy
=x²y²+2xy+1+(x+y)²-2xy(x+y)-2(x+y)
=(xy+1)²+(x+y)²-2(x+y)(xy+1)
=[(xy+1)-(x+y)]²
=(xy-x-y+1)²
=x²y²-2xy+1+(x+y)²-2xy(x+y)-2(x+y)+4xy
=x²y²+2xy+1+(x+y)²-2xy(x+y)-2(x+y)
=(xy+1)²+(x+y)²-2(x+y)(xy+1)
=[(xy+1)-(x+y)]²
=(xy-x-y+1)²
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(xy-1)²+(x+y-2)(x+y-2xy)
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