Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=x^5$, $a^m=x^7$, $a=x$, $a^m/a^n=\frac{x^7y^2}{x^5y^{-3}}$, $m=7$ e $n=5$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=y^{-3}$, $a^m=y^2$, $a=y$, $a^m/a^n=\frac{x^{2}y^2}{y^{-3}}$, $m=2$ e $n=-3$