Решение:
$$\frac{9}{22} - \frac{4}{9} : (3 - 1 \frac{8}{15}) + \frac{8}{11} = \frac{9}{22} - \frac{4}{9} : (\frac{45}{15} - \frac{23}{15}) + \frac{8}{11} = \frac{9}{22} - \frac{4}{9} : \frac{22}{15} + \frac{8}{11} = \frac{9}{22} - \frac{4}{9} \cdot \frac{15}{22} + \frac{8}{11} = \frac{9}{22} - \frac{2 \cdot 5}{3 \cdot 11} + \frac{8}{11} = \frac{9}{22} - \frac{10}{33} + \frac{8}{11} = \frac{27}{66} - \frac{20}{66} + \frac{48}{66} = \frac{7}{66} + \frac{48}{66} = \frac{55}{66} = \frac{5}{6}$$
Ответ: $$\frac{5}{6}$$