3a^3b-6a^2b-45ab
=3ab(a²-2a-15)
=3ab(a-5)(a+3)请问一下 怎么算 a^2x^2-a^2xy-30a^2y^2a^2x^2-a^2xy-30a^2y^2=a²(x²-xy-30y²)=a²(x-6y)(x+5y)