28. Вычислите: 1) \(\sqrt[3]{36^3}\); 2) \(\sqrt[12]{64^2}\); 3) \(\sqrt[4]{\left(\frac{1}{25}\right)^2}\); 4) \(\sqrt[8]{225^4}\).

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

Ответ: 1) 36; 2) 2; 3) \(\frac{1}{5}\); 4) 15.