Thực hiện phép chia 

- Hướng dẫn giải

$\begin{array}{l}\left(10x^{3}y–5x^2{y}^2–25x^4{y}^3\right):\left(-5xy\right)\\ =10x^{3}y:\left(-5xy\right)+\left(–5x^2{y}^2\right):\left(-5xy\right)+\left(–25x^4{y}^3\right):\left(-5xy\right)\\ =-2x^2+xy+5x^3{y}^2\end{array}$

Vậy $\left(10x^{3}y–5x^2{y}^2–25x^4{y}^3\right):\left(-5xy\right)=-2x^2+xy+5x^3{y}^2$