1. Выполните действия: a) $$1\frac{2}{7} + 1\frac{1}{14}$$ б) $$\frac{-5}{6} - \frac{2}{3}$$ в) $$-2,6 \cdot 4$$ г) $$6\frac{4}{9} + 2$$

**Решение:** a) $$1\frac{2}{7} + 1\frac{1}{14} = \frac{9}{7} + \frac{15}{14} = \frac{18}{14} + \frac{15}{14} = \frac{33}{14} = 2\frac{5}{14}$$ б) $$\frac{-5}{6} - \frac{2}{3} = \frac{-5}{6} - \frac{4}{6} = \frac{-9}{6} = -\frac{3}{2} = -1\frac{1}{2}$$ в) $$-2,6 \cdot 4 = -10,4$$ г) $$6\frac{4}{9} + 2 = 6 + \frac{4}{9} + 2 = 8\frac{4}{9}$$