в)$$2,5+1\frac{1}{3}-3\frac{2}{6}$$

в) $$2,5+1\frac{1}{3}-3\frac{2}{6} = 2,5 + \frac{4}{3} - \frac{20}{6} = \frac{5}{2} + \frac{4}{3} - \frac{10}{3} = \frac{5}{2} - \frac{6}{3} = \frac{5}{2} - 2 = \frac{5 - 4}{2} = \frac{1}{2} = 0,5$$

Ответ: $$0,5$$