93-:9-+3

Решим пример:

$$\begin{aligned}
3\frac{4}{5} : 9\frac{1}{2} + 3\frac{9}{10} : 1\frac{1}{2} - 1\frac{5}{8} = \frac{19}{5} : \frac{19}{2} + \frac{39}{10} : \frac{3}{2} - \frac{13}{8} = \frac{19}{5} \cdot \frac{2}{19} + \frac{39}{10} \cdot \frac{2}{3} - \frac{13}{8} = \frac{2}{5} + \frac{13}{5} \cdot \frac{1}{1} - \frac{13}{8} = \frac{2}{5} + \frac{13}{5} - \frac{13}{8} = \frac{15}{5} - \frac{13}{8} = 3 - \frac{13}{8} = \frac{24 - 13}{8} = \frac{11}{8} = 1\frac{3}{8}
\end{aligned}$$

Ответ: $$1\frac{3}{8}$$