2. 1) Вычислите: $$\left(3 \frac{1}{5} + \frac{4}{5}\right)$$

$$3 \frac{1}{5} + \frac{4}{5} = 3 + \frac{1}{5} + \frac{4}{5} = 3 + \frac{1+4}{5} = 3 + \frac{5}{5} = 3 + 1 = **4**$$