x^3+2x^2y^2-3xy^3
=x(x^2+2xy^2-3y^3)再问一题2x3次方-2x平方y+8y-8x2x^3-2x^2y+8y-8x=2x^2(x-y)-8(x-y)=2(x-y)(x^2-4)=2(x-y)(x-2)(x+2)