Ответ:

  1. \(2^{\frac45} \cdot 2^{\frac{11}{5}}=2^3=8\);
  2. \(5^{\frac27} \cdot 5^{\frac57}=5=5\);
  3. \(9^{\frac23}:9^{\frac16}=9^{\frac12}=3\);
  4. \(4^{\frac13}:4^{\frac56}=4^{-\frac12}=\frac12\);
  5. \((8^{\frac12})^{-4}=8^{-2}=\frac1{64}\).

Ответ: 1) 8; 2) 5; 3) 3; 4) \(\frac12\); 5) \(\frac1{64}\).