[tex] \frac{1}{3}\sqrt[3]{81}=\\\frac{1}{3}\sqrt[3]{{3}^{3}\times3}=\\\frac{1}{3}\sqrt[3]{{3}^{3}}\sqrt[3]{3}=\\\frac{1}{3}\times3\sqrt[3]{3}=\\\frac{3}{3}\sqrt[3]{3}=\sqrt[3]{3} [/tex]
The answer is
[tex] \sqrt[3]{3}[/tex]
