Ответ:

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

Ответ: 1) 6; 2) 2; 3) \(1/5\); 4) 15.