Ответ:

  1. \(880-80-100=700\).
  2. \(640-40+200=800\).
  3. \(290+70=360\).
  4. \(680+50=730\).
  5. \(480:6=80\).
  6. \(260\cdot3=780\).
  7. \(140\cdot6=840\).
  8. \(360:9=40\).

Ответ: 700; 800; 360; 730; 80; 780; 840; 40.