Ответ:

\(\frac{8}{3}-\frac{3}{10}=\frac{80}{30}-\frac{9}{30}=\frac{71}{30}\).

\(\frac{9}{2}\cdot\frac{71}{30}=\frac{213}{20}\).

\(\frac{213}{20}:\frac{4}{5}=\frac{213}{20}\cdot\frac{5}{4}=\frac{213}{16}\).

Ответ: \(\frac{213}{16}=13\frac{5}{16}\).