Làm tính chia: (5xy^2 + 9xy – x^2y^2) : (- xy)

* Hướng dẫn giải

$$\begin{gathered} \left(5x{y}^2+9xy-x^2{y}^2\right):\left(-xy\right) \\ =\left[5x{y}^2-\left(-xy\right)\right]+\left[9xy:\left(-xy\right)\right]+\left[\left(-x^2{y}^2\right):\left(-xy\right)\right] \\ =-5y-9+xy \end{gathered}$$