2) 6 1/5 - 4/5 =

2) $$\begin{aligned}6\frac{1}{5} - \frac{4}{5} &= 5 + \frac{5}{5} + \frac{1}{5} - \frac{4}{5} = 5 + \frac{6}{5} - \frac{4}{5} = 5\frac{2}{5}\\\\&=\frac{5 \cdot 5 + 2}{5} = \frac{25+2}{5} = \frac{27}{5} = 5\frac{2}{5}\end{aligned}$$

Ответ: 5 2/5