Решение:
$$\frac{11}{14} + \frac{8}{15} : (4 - 2\frac{26}{27}) - 1\frac{1}{10} = $$
$$\frac{11}{14} + \frac{8}{15} : (4 - \frac{80}{27}) - \frac{11}{10} =$$
$$\frac{11}{14} + \frac{8}{15} : (\frac{108}{27} - \frac{80}{27}) - \frac{11}{10} =$$
$$\frac{11}{14} + \frac{8}{15} : \frac{28}{27} - \frac{11}{10} =$$
$$\frac{11}{14} + \frac{8}{15} \cdot \frac{27}{28} - \frac{11}{10} =$$
$$\frac{11}{14} + \frac{2}{5} \cdot \frac{9}{7} - \frac{11}{10} =$$
$$\frac{11}{14} + \frac{18}{35} - \frac{11}{10} =$$
$$\frac{55}{70} + \frac{36}{70} - \frac{77}{70} =$$
$$\frac{55 + 36 - 77}{70} = \frac{14}{70} = \frac{1}{5}$$
Ответ: $$\frac{1}{5}$$