Ответ:

  1. \(7\,000 \cdot 100 + 6\,000 = 700\,000 + 6\,000 = 706\,000\).
  2. \(8\,600 \cdot 100 - 60\,000 = 860\,000 - 60\,000 = 800\,000\).
  3. \(999\,999 + 1 = 1\,000\,000\).
  4. \(1\,000\,000 : 10 = 100\,000\).

Ответ: 706 000; 800 000; 1 000 000; 100 000.