2. Реши уравнения: а) 4,8x − 2,9 = 21,34; б) 18 · (0,3x + 11,6) = 345,42.

а) \(4.8x - 2.9 = 21.34\); \(4.8x = 24.24\); \(x = 24.24 : 4.8 = 5.05\).

б) \(18(0.3x + 11.6) = 345.42\); \(0.3x + 11.6 = 345.42 : 18 = 19.19\); \(0.3x = 7.59\); \(x = 7.59 : 0.3 = 25.3\).

Ответ: а) x = 5,05; б) x = 25,3.