分解因试(x-1)²-2(x-1)+1 x³y-2x²y²+xy³

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分解因试(x-1)²-2(x-1)+1x³y-2x²y²+xy³分解因试(x-1)²-2(x-1)+1x³y-2x²y&

分解因试(x-1)²-2(x-1)+1 x³y-2x²y²+xy³
分解因试(x-1)²-2(x-1)+1 x³y-2x²y²+xy³

分解因试(x-1)²-2(x-1)+1 x³y-2x²y²+xy³
(x-1)²-2(x-1)+1
=[(x-1)-1]²
=(x-2)²
x³y-2x²y²+xy³
=xy(x²-2xy+y²)
=xy(x-y)²