-x立方y+6x方y-8xy =-xy(x^2-6x+8) =-xy(x-2)(x-4),4,-x立方y+6x方y-8xy =-xy(x^2-6x+8) =-xy(x-2)(x-4),1,xy(x-2y)(-x+4y),1,-x^3y+6x^2y-8xy =-xy(x^2-6x+8) =-xy(x-2)(x-4),0,
