45 1 3--0,8-. 56 3

$$4\frac{5}{6} \cdot 3 - 0,8 \cdot \frac{1}{3} = \frac{29}{6} \cdot 3 - \frac{8}{10} \cdot \frac{1}{3} = \frac{29}{2} - \frac{4}{5} \cdot \frac{1}{3} = \frac{29}{2} - \frac{4}{15} = \frac{29 \cdot 15 - 4 \cdot 2}{30} = \frac{435 - 8}{30} = \frac{427}{30} = 14 \frac{7}{30}$$

Ответ: $$14 \frac{7}{30}$$