(15^3y-25x^2y^2-5x^2)/(-5x^3)
问题描述：
(15^3y-25x^2y^2-5x^2)/(-5x^3)
答
(15x^3y-25x^2y^2-5x^2)/(-5x^3)
=-5y+5y^2/x +1/x