Ответ:

  1. \(\frac{(7^{-1})^3}{7\cdot49}=\frac{7^{-3}}{7^3}=7^{-6}=\frac{1}{117649}\).

  2. \(3^{-11}\cdot(3^5)^2=3^{-11+10}=3^{-1}=\frac13\).

  3. \(\frac{8^{-6}\cdot8^{-7}}{8^{-12}}=8^{-6-7+12}=8^{-1}=\frac18\).

  4. \((7\cdot10^3)^2\cdot(16\cdot10^{-4})=49\cdot10^6\cdot16\cdot10^{-4}=784\cdot10^2=78400\).

  5. \(\frac{2^{-7}\cdot2^{17}}{2^0}=2^{10}=1024\).

  6. \(\frac{(6^2)^{-6}}{6^{-20}}=6^{-12-(-20)}=6^8=1679616\).

  7. \(7^{-6}\cdot(7^2)^4=7^{-6+8}=7^2=49\).

  8. \(\frac{6^{12}\cdot11^{10}}{66^{10}}=\frac{6^{12}\cdot11^{10}}{6^{10}\cdot11^{10}}=6^2=36\).

Ответ: 1) \(\frac{1}{117649}\); 2) \(\frac13\); 3) \(\frac18\); 4) 78400; 5) 1024; 6) 1679616; 7) 49; 8) 36.