7) 5 1/3 - 2 2/3 = 4 + 3/3 + 1/3 - 2 2/3 = 4 + 4/3 - 2 - 2/3 =

7) $$\begin{aligned}5\frac{1}{3} - 2\frac{2}{3} &= 4 + \frac{3}{3} + \frac{1}{3} - 2\frac{2}{3} = 4 + \frac{4}{3} - 2 - \frac{2}{3} = 2\frac{2}{3}\\\\&=\frac{2 \cdot 3 + 2}{3} = \frac{6+2}{3} = \frac{8}{3} = 2\frac{2}{3}\end{aligned}$$

Ответ: 2 2/3