Ответ:

  1. \(8 + 17 = 25\);
  2. \(7 + 5 = 12\);
  3. \(3 + 7 = 10\);
  4. \(7 + 14 = 21\);
  5. \(6 + 12 = 18\);
  6. \(58 + 12 = 70\);
  7. \(70 + 10 = 80\).