(8x²y-2xy²-3y³)分之(6x³-5x²y-4xy²)=[y(8x²-2xy-3y²)分之x(6x²-5xy-4y²)=[y(4x-3y)(2x+y)]分之x(2x+y)(3x-4y)=[y(4x-3y)]分之x(3x-4y)