5x(x-3y)^2+2y(3y-x)^3
问题描述：
5x(x-3y)^2+2y(3y-x)^3
火速!
答
5x(x-3y)^2+2y(3y-x)^3
=(x-3y)²(5x-2y(x-3y))
=(x-3y)²(5x-2xy+6y²)