Ответ:

  1. \(\sqrt[6]{36^3}=\sqrt{36}=6\).
  2. \(\sqrt[12]{64^2}=\sqrt[6]{64}=2\).
  3. \(\sqrt[4]{\left(\frac{1}{25}\right)^2}=\sqrt{\frac{1}{25}}=\frac{1}{5}\).
  4. \(\sqrt[8]{225^4}=\sqrt{225}=15\).

Ответ: 1) 6; 2) 2; 3) \(\frac{1}{5}\); 4) 15.