Решение:
\( \frac{3}{4} + \frac{11}{8} = \frac{3 \times 2}{4 \times 2} + \frac{11}{8} = \frac{6}{8} + \frac{11}{8} = \frac{6 + 11}{8} = \frac{17}{8} \)
\( \frac{8}{5} \times \frac{17}{8} \)
\( \frac{8}{5} \times \frac{17}{8} = \frac{1}{5} \times \frac{17}{1} = \frac{17}{5} \)
Ответ: 17/5