(xy-1)的平方-(x+y-2xy)(2-x-y)
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(xy-1)的平方-(x+y-2xy)(2-x-y)
(xy-1)²-(x+y-2xy)(2-x-y)
=(xy-1)²+(x+y-2xy)(x+y-2)
=x²y²-2xy+1+(x+y)²-2(x+y)-2xy(x+y)+4xy
=x²y²-2x²y-2xy²+x²+y²+4xy-2x-2y+1
再问: 不是因式分解吗????
再答: 因式分解
再问: 因式分解最后不应该有那么多的多项式呀
再答: (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)²-2(xy+1)(x+y)+(x+y)² =(xy+1-x-y)² =[x(y-1)-(y-1)]² =(x-1)²(y-1)²
=(xy-1)²+(x+y-2xy)(x+y-2)
=x²y²-2xy+1+(x+y)²-2(x+y)-2xy(x+y)+4xy
=x²y²-2x²y-2xy²+x²+y²+4xy-2x-2y+1
再问: 不是因式分解吗????
再答: 因式分解
再问: 因式分解最后不应该有那么多的多项式呀
再答: (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)²-2(xy+1)(x+y)+(x+y)² =(xy+1-x-y)² =[x(y-1)-(y-1)]² =(x-1)²(y-1)²
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