8) 3 4/9 : (1 5/9 - 4/7)

8) \(3\frac{4}{9} : (1\frac{5}{9} - \frac{4}{7}) = \frac{31}{9} : (\frac{14}{9} - \frac{4}{7}) = \frac{31}{9} : (\frac{98}{63} - \frac{36}{63}) = \frac{31}{9} : \frac{62}{63} = \frac{31}{9} \cdot \frac{63}{62} = \frac{1}{1} \cdot \frac{7}{2} = \frac{7}{2} = 3\frac{1}{2}\)
Ответ: 7/2