Hi,
ich versuche mal mein Glück^^.
$$\sqrt[3]{2\sqrt{2\sqrt[3]{2}}} = (2*(2\cdot2^{\frac13})^{\frac12})^{\frac13} = 2^{\frac13}\cdot2^{\frac12\cdot\frac13}\cdot2^{\frac13\cdot\frac12\cdot\frac16} $$
$$= 2^{\frac13+\frac16+\frac{1}{18}} = 2^{\frac{5}{9}} = \sqrt[9]{2^5} = \sqrt[9]{32}$$
Grüße