Ответ:

  1. \(18-5+2=15\)
  2. \(10-7+4=7\)
  3. \(19-4+5=20\)
  4. \(18-6-1=11\)
  5. \(14+5-8=11\)
  6. \(17+3-4=16\)
  7. \(4+6=10\)
  8. \(8-5=3\)
  9. \(10+9=19\)