Applicare la formula: $\frac{a}{a}$$=1$, dove $a=x$ e $a/a=\frac{36xy^4}{20xy^2}$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=y^2$, $a^m=y^4$, $a=y$, $a^m/a^n=\frac{36y^4}{20y^2}$, $m=4$ e $n=2$

Applicare la formula: $\frac{ab}{c}$$=\frac{a}{c}b$, dove $ab=36y^{2}$, $a=36$, $b=y^{2}$, $c=20$ e $ab/c=\frac{36y^{2}}{20}$