x的三次方-2x²y+xy²-x

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x的三次方-2x²y+xy²-x
x的三次方-2x²y+xy²-x

x的三次方-2x²y+xy²-x
=x(x²-2xy+y²-1)
=x[(x-y)²-1]
=x(x-y+1)(x-y-1)