Applicare la formula: $\frac{a^n}{a}$$=a^{\left(n-1\right)}$, dove $a^n/a=\frac{10a^7b^9}{15a^5b}$, $a^n=b^9$, $a=b$ e $n=9$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=a^5$, $a^m=a^7$, $a^m/a^n=\frac{10a^7b^{8}}{15a^5}$, $m=7$ e $n=5$

Applicare la formula: $\frac{ab}{c}$$=\frac{a}{c}b$, dove $ab=10a^{2}b^{8}$, $a=10$, $b=a^{2}b^{8}$, $c=15$ e $ab/c=\frac{10a^{2}b^{8}}{15}$