Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=x^2$, $a^m=x^3$, $a=x$, $a^m/a^n=\frac{15x^3y^7}{x^2y^5}$, $m=3$ e $n=2$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=y^5$, $a^m=y^7$, $a=y$, $a^m/a^n=\frac{15xy^7}{y^5}$, $m=7$ e $n=5$