Ответ:

  1. \(\sqrt[6]{\sqrt[4]{3^{16}\cdot6^8}}=\sqrt[6]{\sqrt[4]{2^8\cdot3^{24}}}=\sqrt[6]{2^2\cdot3^6}=3\sqrt[3]{2}.\)
  2. \(\frac{\sqrt{10}\cdot\sqrt[3]{343}}{\sqrt[3]{7}\cdot\sqrt{250}}=\frac{7\sqrt{10}}{5\sqrt{10}\sqrt[3]{7}}=\frac{\sqrt[3]{49}}{5}.\)
  3. \(27^{2/3}-\left(\frac{1}{16}\right)^{-3/4}=9-8=1.\)
  4. \(\frac{3\cdot7^{2/3}}{21^{2/3}}=\frac{3}{3^{2/3}}=\sqrt[3]{3}.\)
  5. \(\frac{\sqrt{80}+\sqrt{45}}{7}-\sqrt5=\frac{4\sqrt5+3\sqrt5}{7}-\sqrt5=0.\)

Ответ: а) \(3\sqrt[3]{2}\); б) \(\frac{\sqrt[3]{49}}{5}\); в) 1; г) \(\sqrt[3]{3}\); д) 0.