Ответ:

  1. \(\sqrt{2}=2^{\frac12}\).
  2. \(\frac{\sqrt3}{3}=\frac{3^{\frac12}}{3^1}=3^{-\frac12}\).
  3. \(\frac{1}{2\sqrt2}=\frac{1}{2\cdot2^{\frac12}}=2^{-\frac32}\).
  4. \(\sqrt[3]{25}=25^{\frac13}=5^{\frac23}\).
  5. \(\sqrt[4]{27}=27^{\frac14}=3^{\frac34}\).
  6. \(\sqrt[3]{\left(\frac15\right)^2}=\left(\frac15\right)^{\frac23}=5^{-\frac23}\).

Ответ: 1) \(2^{\frac12}\); 2) \(3^{-\frac12}\); 3) \(2^{-\frac32}\); 4) \(5^{\frac23}\); 5) \(3^{\frac34}\); 6) \(5^{-\frac23}\).