Question

(2x+2y4)(x+y1)$(2 {x}^{2} {y}^{ - 1) \: ( {x}^{5} {y}^{? \\ - 1}$

Answer 1

we have

$\begin{gathered} (2x^{(-2)}y^{(-4)})\cdot(x^5\cdot y^{(-1)})=2x^{(-2+5)}\cdot y^{(-4-1)}=2x^{(3)}\cdot y^{(-5)}=\frac{2x^3}{y^5} \\ \end{gathered}$