4. Реши уравнения: 48 + x = 56; 56 : x = 8; 5 · x = 25; 66 − x = 24.

1. \(48 + x = 56\); \(x = 56 − 48 = 8\).
2. \(56 : x = 8\); \(x = 56 : 8 = 7\).
3. \(5 · x = 25\); \(x = 25 : 5 = 5\).
4. \(66 − x = 24\); \(x = 66 − 24 = 42\).

Ответ: 8; 7; 5; 42.