Ответ:

  1. \(2.8+1.9=4.7\);
  2. \(6.4+0.5=6.9\);
  3. \(8+2.6=10.6\);
  4. \(4.7+16=20.7\);
  5. \(2.58+1.4=3.98\);
  6. \(7.2+15.68=22.88\);
  7. \(0.906+12.8=13.706\);
  8. \(0.47+0.741=1.211\).