244. Реши уравнения: 20 007 − x = 20 000; x − 900 = 1 000; x + 200 = 3 200.

Решение:

1. \(20\,007 - x = 20\,000\)
   \(x = 20\,007 - 20\,000\)
   \(x = 7\).
2. \(x - 900 = 1\,000\)
   \(x = 1\,000 + 900\)
   \(x = 1\,900\).
3. \(x + 200 = 3\,200\)
   \(x = 3\,200 - 200\)
   \(x = 3\,000\).

Проверка: \(20\,007 - 7 = 20\,000\); \(1\,900 - 900 = 1\,000\); \(3\,000 + 200 = 3\,200\).

Ответ: \(x = 7\); \(x = 1\,900\); \(x = 3\,000\).