分解因式:(1) (x-y)³-(x-y) (2)x³y³-2x²y²
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分解因式:(1) (x-y)³-(x-y) (2)x³y³-2x²y²+xy (3)a³c-4a²bc+4ab²c (4)(x²+y²)²-4x²y²
(1) (x-y)³-(x-y)
=(x-y)[(x-y)²-1]
=(x-y)(x-y+1)(x-y-1)
(2)x³y³-2x²y²+xy
=xy(x²y²-2xy+1)
=xy(xy-1)²
(3)a³c-4a²bc+4ab²c
=ac(a²-4ab+4b²)
=ac(a-2b)²
(4)(x²+y²)²-4x²y²
=(x²+y²+2xy)(x²+y²-2xy)
=(x+y)²(x-y)²
=(x-y)[(x-y)²-1]
=(x-y)(x-y+1)(x-y-1)
(2)x³y³-2x²y²+xy
=xy(x²y²-2xy+1)
=xy(xy-1)²
(3)a³c-4a²bc+4ab²c
=ac(a²-4ab+4b²)
=ac(a-2b)²
(4)(x²+y²)²-4x²y²
=(x²+y²+2xy)(x²+y²-2xy)
=(x+y)²(x-y)²
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