Вопрос:

980-80-100, 640-40+200, 290+70, 680+50, 140*6, 260*3, 480:6, 360:9

Ответ:

  1. 980 - 80 - 100 = 900 - 100 = 800
  2. 640 - 40 + 200 = 600 + 200 = 800
  3. 290 + 70 = 360
  4. 680 + 50 = 730
  5. 140 * 6 = 840
  6. 260 * 3 = 780
  7. 480 : 6 = 80
  8. 360 : 9 = 40