в) $$14\frac{4}{7} - 1\frac{3}{7}+3\frac{1}{7}-2\frac{5}{7}$$

$$\begin{aligned} 14\frac{4}{7} - 1\frac{3}{7}+3\frac{1}{7}-2\frac{5}{7} = \frac{102}{7} - \frac{10}{7} + \frac{22}{7} - \frac{19}{7} = \frac{102-10+22-19}{7} = \frac{95}{7} = 13\frac{4}{7} \end{aligned}$$
Ответ: $$13\frac{4}{7}$$