Ответ:

  1. \(7 + 4 = 11\).
  2. \(18 : 9 = 2\).
  3. \(27 : 3 = 9\).
  4. \(6 \cdot 7 = 42\).
  5. \(32 : 8 \cdot 6 = 24\).
  6. \(\frac{5}{5} + \frac{2}{5} = \frac{7}{5}\).
  7. \(1 - \frac{3}{9} = \frac{6}{9}\).
  8. \(3,7 - 1,5 = 2,2\).