\[\begin{array}{l}
{\text{Упростите:}} \hfill \\
\sqrt[6]{{99 + 70\sqrt 2 }} + \sqrt[6]{{99 - 70\sqrt 2 }}. \hfill \\
\end{array}\]
\[\begin{array}{l}
99 + 70\sqrt 2 = {\left( {\sqrt 2 + 1} \right)^6} \hfill \\
99 - 70\sqrt 2 = {\left( {\sqrt 2 - 1} \right)^6} \hfill \\
\end{array}\]
\[2\sqrt 2 \]
