Ответ:

  1. \(7+5-8=12-8=4\).
  2. \(4+9-6=13-6=7\).
  3. \(8+7-5=15-5=10\).
  4. \(10+3-4=13-4=9\).
  5. \(2+10-6=12-6=6\).
  6. \(19-10+3=9+3=12\).
  7. \(9+2-1=11-1=10\).
  8. \(9+3-2=12-2=10\).
  9. \(9+4-3=13-3=10\).