2)2 3/8·3 1/13+5/12·3 1/13-3 1/13·1/6

2) $$2 \frac{3}{8} \cdot 3 \frac{1}{13} + \frac{5}{12} \cdot 3 \frac{1}{13} - 3 \frac{1}{13} \cdot \frac{1}{6} = 3 \frac{1}{13} \cdot (2 \frac{3}{8} + \frac{5}{12} - \frac{1}{6}) = 3 \frac{1}{13} \cdot (2 + \frac{3}{8} + \frac{5}{12} - \frac{1}{6}) = 3 \frac{1}{13} \cdot (2 + \frac{3 \cdot 3 + 5 \cdot 2 - 1 \cdot 4}{24}) = 3 \frac{1}{13} \cdot (2 + \frac{9 + 10 - 4}{24}) = 3 \frac{1}{13} \cdot (2 + \frac{15}{24}) = 3 \frac{1}{13} \cdot (2 + \frac{5}{8}) = 3 \frac{1}{13} \cdot 2 \frac{5}{8} = \frac{40}{13} \cdot \frac{21}{8} = \frac{10}{13} \cdot \frac{21}{2} = \frac{5}{13} \cdot 21 = \frac{105}{13} = 8 \frac{1}{13}$$

Ответ: 8 1/13