Applicare la formula: $\frac{x^a}{b}$$=\frac{1}{bx^{-a}}$, dove $a=-2$, $b=9^3$ e $x=9$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=9^3$, $a^m=9^7$, $a=9$, $a^m/a^n=\frac{9^7}{9^3\cdot 9^{2}}$, $m=7$ e $n=3$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=9^{2}$, $a^m=9^{4}$, $a=9$, $a^m/a^n=\frac{9^{4}}{9^{2}}$, $m=4$ e $n=2$

Applicare la formula: $a^b$$=a^b$, dove $a=9$, $b=2$ e $a^b=9^{2}$