Applicare la formula: $\frac{a}{a}$$=1$, dove $a=9$ e $a/a=\frac{9x^2y^8}{9xy^4}$

Applicare la formula: $\frac{a^n}{a}$$=a^{\left(n-1\right)}$, dove $a^n/a=\frac{x^2y^8}{xy^4}$, $a^n=x^2$, $a=x$ e $n=2$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=y^4$, $a^m=y^8$, $a=y$, $a^m/a^n=\frac{xy^8}{y^4}$, $m=8$ e $n=4$