6.252 Решите уравнение: a) 4x + 7x = 1,98; б) 9z - 5z = 5,52; в) 2t + 5t + 3,18 = 25; г) 8p - 2p - 14,21 = 7.

Решаем уравнения по порядку: a) \(4x + 7x = 1,98\) \(11x = 1,98\) \(x = \frac{1,98}{11} = 0,18\) Ответ: \(x = \textbf{0,18}\) б) \(9z - 5z = 5,52\) \(4z = 5,52\) \(z = \frac{5,52}{4} = 1,38\) Ответ: \(z = \textbf{1,38}\) в) \(2t + 5t + 3,18 = 25\) \(7t + 3,18 = 25\) \(7t = 25 - 3,18 = 21,82\) \(t = \frac{21,82}{7} = 3,11714... \approx 3,12\) Ответ: \(t \approx \textbf{3,12}\) г) \(8p - 2p - 14,21 = 7\) \(6p - 14,21 = 7\) \(6p = 7 + 14,21 = 21,21\) \(p = \frac{21,21}{6} = 3,535 \approx 3,54\) Ответ: \(p \approx \textbf{3,54}\)