4.Решите уравнения: a) x + \(\frac{1}{5}\) = \(\frac{4}{10}\).

Решим уравнение, чтобы найти значение x.

a) \(x + \frac{1}{5} = \frac{4}{10}\)

\(x = \frac{4}{10} - \frac{1}{5}\)

\(x = \frac{4}{10} - \frac{1 \cdot 2}{5 \cdot 2}\)

\(x = \frac{4}{10} - \frac{2}{10}\)

\(x = \frac{4 - 2}{10}\)

\(x = \frac{2}{10}\)

\(x = \frac{1}{5}\)

Ответ: \(x = \frac{1}{5}\)