$\begin{array}{l} \sqrt[n]{a} \cdot \sqrt[n]{b} = \sqrt[n]{a\cdot b} \\ \sqrt[n]{a}:\sqrt[n]{b}=\sqrt[n]{\frac{a}{b}} \\ \sqrt[n]{\sqrt[m]{a}}=\sqrt[{mn}]{a} \\ \\ \textbf{Gegeben:} \\ {a=26 \qquad b=22 \qquad m=9 \qquad n=6}\\ \\ \textbf{Rechnung:} \\ \sqrt[6]{26} \cdot \sqrt[6]{22} = \sqrt[6]{26\cdot 22}= \sqrt[6]{572}=2,88 \\ \sqrt[6]{26}:\sqrt[6]{22}=\sqrt[6]{\frac{26}{22}} = \sqrt[6]{1\frac{2}{11}}=1,03 \\ \sqrt[6]{\sqrt[9]{26}}=\sqrt[{9\cdot 6}]{26}= \sqrt[54]{26}=1,06 \\ \end{array}$