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因式分解:xy³-2x²y²+x³y
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因式分解3x-12x³,x²+y²-1-2xy
因式分解:x²y-2xy²+y³
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
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因式分解:(x+y)³+2xy-2x²y-2xy²-1
因式分解x^3y-6x^2y^2+9xy^3
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因式分解:(1)x²y-2xy²+y³ (2)(x+2y)²-y²