2x^2y^3+x^2y^2/5x^3y^2-x^2y^2=?
问题描述：
2x^2y^3+x^2y^2/5x^3y^2-x^2y^2=?
答
=x²y²(2y+1)/x²y²(5x-1)
=(2y+1)/(5x-1)