1、x(x-1)(x-2)-6 =x^3-3x^2+2x-6=x^2(x-3)+2(x-3)=(x-3)(x^2+2)2、ax(y^3+b^3)+by(bx^2+ya^2 )=axy^3+ab^3x+b^2x^2y+a^2by^2=xy(ay^2+b^2x)+ab(b^2x+ay^2)=(xy+ab)(ay^2+b^2x)