Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=x^2$, $a^m=x^3$, $a=x$, $a^m/a^n=\frac{5x^3y^9}{20x^2y^{-2}}$, $m=3$ e $n=2$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=y^{-2}$, $a^m=y^9$, $a=y$, $a^m/a^n=\frac{5xy^9}{20y^{-2}}$, $m=9$ e $n=-2$

Applicare la formula: $\frac{ab}{c}$$=\frac{a}{c}b$, dove $ab=5xy^{11}$, $a=5$, $b=xy^{11}$, $c=20$ e $ab/c=\frac{5xy^{11}}{20}$