Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=16$, $b=4$ e $a/b=\frac{16}{4}$

Applicare la formula: $a^nb^n$$=\left(ab\right)^n$, dove $a=\frac{5}{4}$, $b=4$ e $n=\frac{1}{2}$

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=5$, $b=4$, $c=4$, $a/b=\frac{5}{4}$ e $ca/b=4\left(\frac{5}{4}\right)$

Applicare la formula: $ab$$=ab$, dove $ab=4\cdot 5$, $a=4$ e $b=5$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=20$, $b=4$ e $a/b=\frac{20}{4}$