4) \(6\frac{5}{9} - \frac{4}{9} = \)

\(6\frac{5}{9} - \frac{4}{9} = 6 + (\frac{5}{9} - \frac{4}{9}) = 6 + \frac{1}{9} = 6\frac{1}{9}\)

Ответ: \(6\frac{1}{9}\)