Ответ:

  1. \(3.8+2.9=6.7\).
  2. \(9.3+7.8=17.1\).
  3. \(8.4+3.7=12.1\).
  4. \(8.8+5.9=14.7\).
  5. \(\frac{4.8\cdot0.4}{0.6}=\frac{1.92}{0.6}=3.2\).
  6. \(\frac{5.6\cdot0.3}{0.8}=\frac{1.68}{0.8}=2.1\).