$$\sqrt[3]{\frac{3}{5}}+\frac{\sqrt[3]{9}}{5}-\sqrt[3]{81}$$
$\frac{\sqrt[3]{3}\left(\sqrt[3]{3}+5^{\frac{2}{3}}-15\right)}{5}\approx -3.067299281$
$\frac{\sqrt[3]{3} {(\sqrt[3]{3} + 5 ^ {\frac{2}{3}} - 15)}}{5} = -3.0672992810100945$
