№4 Найдите значения выражения: а) $$3\frac{2}{5}+4\frac{1}{5}-2\frac{2}{5}-3\frac{4}{5}$$

$$\begin{aligned} &3\frac{2}{5}+4\frac{1}{5}-2\frac{2}{5}-3\frac{4}{5} = \frac{17}{5} + \frac{21}{5} - \frac{12}{5} - \frac{19}{5} = \frac{17+21-12-19}{5} = \frac{7}{5} = 1\frac{2}{5} \end{aligned}$$
Ответ: $$1\frac{2}{5}$$