16 2:(1-3)

Решим пример:

$$\begin{aligned}
2\frac{3}{5} : \left(\frac{1}{4} - \frac{3}{5}\right) = \frac{13}{5} : \left(\frac{5 - 12}{20}\right) = \frac{13}{5} : \frac{-7}{20} = \frac{13}{5} \cdot \frac{-20}{7} = \frac{13}{1} \cdot \frac{-4}{7} = -\frac{52}{7} = -7\frac{3}{7}
\end{aligned}$$

Ответ: $$-7\frac{3}{7}$$