Ответ:

1) \(\sqrt[6]{36^3}=\sqrt[6]{(6^2)^3}=\sqrt[6]{6^6}=6\).

2) \(\sqrt[12]{64^2}=\sqrt[12]{(2^6)^2}=\sqrt[12]{2^{12}}=2\).

3) \(\sqrt[4]{\left(\frac{1}{25}\right)^2}=\left(\frac{1}{25}\right)^{\frac{2}{4}}=\sqrt{\frac{1}{25}}=\frac{1}{5}\).

4) \(\sqrt[8]{225^4}=\sqrt[8]{(15^2)^4}=\sqrt[8]{15^8}=15\).

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