Ответ:

  1. \(\sqrt[4]{324}:\sqrt[4]{4}=\sqrt[4]{81}=3\).
  2. \(\sqrt[3]{128}:\sqrt[3]{2000}=\sqrt[3]{\frac{128}{2000}}=\sqrt[3]{\frac8{125}}=\frac25\).
  3. \(\frac{\sqrt[3]{16}}{\sqrt[3]{2}}=\sqrt[3]{\frac{16}{2}}=\sqrt[3]{8}=2\).
  4. \(\frac{\sqrt[5]{256}}{\sqrt[5]{8}}=\sqrt[5]{32}=2\).
  5. \(\frac{\sqrt{20}-\sqrt{45}}{\sqrt5}=\frac{2\sqrt5-3\sqrt5}{\sqrt5}=-1\).
  6. \(\frac{\sqrt[3]{625}-\sqrt[3]{5}}{\sqrt[3]{5}}=\sqrt[3]{\frac{625}{5}}-1=\sqrt[3]{125}-1=4\).

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