Ответ:

  1. 24 × (15 + 5) = 24 × 20 = 480.
  2. 125 × 8 × 3 = 1000 × 3 = 3000.
  3. 48 × (25 × 4) = 48 × 100 = 4800.
  4. 64 × (20 − 1) = 1280 − 64 = 1216.
  5. 37 × 100 − 37 × 3 = 3700 − 111 = 3589.
  6. 900 ÷ 9 = 100.
  7. 900 ÷ 9 = 100.
  8. (63 ÷ 9) × 16 = 7 × 16 = 112.
  9. 72 × 100 = 7200.
  10. (45 + 55) × 18 = 100 × 18 = 1800.
  11. 250 × 4 = 1000.
  12. 840 ÷ (7 × 4) = 840 ÷ 28 = 30.
  13. 900 − 600 = 300.
  14. 1200 − 500 = 700.
  15. (32 + 68) × 125 = 100 × 125 = 12 500.