Ответ:

  1. \(\sqrt[4]{324}:\sqrt[4]{4}=\sqrt[4]{81}=3\).
  2. \(\sqrt[3]{128}:\sqrt[3]{2000}=\sqrt[3]{\frac{128}{2000}}=\sqrt[3]{\frac{8}{125}}=\frac25\).
  3. \(\frac{\sqrt[3]{16}}{\sqrt[3]{2}}=\sqrt[3]{8}=2\).
  4. \(\frac{\sqrt[5]{256}}{\sqrt[5]{8}}=\sqrt[5]{32}=2\).
  5. \((\sqrt{25}-\sqrt{45}):\sqrt5=\frac{5-3\sqrt5}{\sqrt5}=\sqrt5-3\).
  6. \((\sqrt[3]{625}-\sqrt[3]{5}):\sqrt[3]{5}=(5\sqrt[3]{5}-\sqrt[3]{5}):\sqrt[3]{5}=4\).

Ответ: 1) 3; 2) \(\frac25\); 3) 2; 4) 2; 5) \(\sqrt5-3\); 6) 4.