Applicare la formula: $\left(ab\right)^n$$=a^nb^n$, dove $a=81$, $b=a^4$ e $n=\frac{1}{4}$

Applicare la formula: $a^b$$=a^b$, dove $a=81$, $b=\frac{1}{4}$ e $a^b=\sqrt[4]{81}$

Applicare la formula: $\left(x^a\right)^b$$=x^{ab}$, dove $a=4$, $b=\frac{1}{4}$, $x^a^b=\sqrt[4]{a^4}$, $x=a$ e $x^a=a^4$

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=1$, $b=4$, $c=4$, $a/b=\frac{1}{4}$ e $ca/b=4\cdot \left(\frac{1}{4}\right)$

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