Выполним вычисление:
$${\frac{8}{5}} \cdot ({\frac{3}{4}} + {\frac{11}{8}}).$$
$${\frac{3}{4}} + {\frac{11}{8}} = {\frac{3 \cdot 2}{4 \cdot 2}} + {\frac{11}{8}} = {\frac{6}{8}} + {\frac{11}{8}} = {\frac{6 + 11}{8}} = {\frac{17}{8}}.$$
$${\frac{8}{5}} \cdot {\frac{17}{8}} = {\frac{8 \cdot 17}{5 \cdot 8}} = {\frac{17}{5}}.$$
Ответ: $$\frac{17}{5}$$