г) $$3\frac{1}{7} - 1\frac{2}{7}-1\frac{3}{7}+4\frac{5}{7}$$

$$\begin{aligned} 3\frac{1}{7} - 1\frac{2}{7}-1\frac{3}{7}+4\frac{5}{7} = \frac{22}{7} - \frac{9}{7} - \frac{10}{7} + \frac{33}{7} = \frac{22-9-10+33}{7} = \frac{36}{7} = 5\frac{1}{7} \end{aligned}$$
Ответ: $$5\frac{1}{7}$$