Ответ:

  1. \(3\cdot\frac14+8\cdot4-16=\frac34+32-16=\frac{67}{4}\).
  2. \(7\cdot\frac14-16\cdot8+8=\frac74-128+8=-\frac{473}{4}\).
  3. \(\frac94-\frac94+\frac23=\frac23\).
  4. \(\frac25+\frac{25}{4}-1=\frac{113}{20}\).
  5. \(3^2\cdot3^{-6}+3^3\cdot3^{-5}=3^{-4}+3^{-2}=\frac1{81}+\frac19=\frac{10}{81}\).
  6. \(5^6\cdot5^{-8}-5^6\cdot5^{-7}=\frac1{25}-\frac15=-\frac4{25}\).
  7. \(\frac{27^2}{9}-1\cdot\frac1{81}=81-\frac1{81}=\frac{6560}{81}\).
  8. \(\frac{8^3}{16}-\frac{2^7}{16}=32-8=24\).