Вариант A2. 3) Решите уравнения: а) 15 4/19 + x + 3 17/19 = 21 2/19; б) 6,7x − 4,83 = 5,22.

а)

\(x = 21\frac{2}{19} - 15\frac{4}{19} - 3\frac{17}{19}\)

\(x = \frac{401}{19} - \frac{289}{19} - \frac{74}{19} = \frac{38}{19} = 2\).

б)

\(6.7x - 4.83 = 5.22\)

\(6.7x = 5.22 + 4.83 = 10.05\)

\(x = 10.05 : 6.7 = 1.5\).

Ответ: а) \(x = 2\); б) \(x = 1.5\).