в) $$ \sqrt{6} = \sqrt[4]{6^2} = \sqrt[4]{36} $$, $$ \sqrt[4]{17} $$, $$ \sqrt{40} = \sqrt[4]{40^2} = \sqrt[4]{1600} $$.
Ответ: $$\sqrt[4]{36}$$, $$\sqrt[4]{17}$$ и $$\sqrt[4]{1600}$$