1. Выполните действия: a) $$\frac{15}{17} - \frac{10}{17} + \frac{3}{17}$$; б) $$2\frac{5}{7} + 6\frac{3}{7}$$; в) $$8 - 2\frac{5}{6}$$; г) $$4\frac{4}{11} - 2\frac{10}{11}$$

a) $$\frac{15}{17} - \frac{10}{17} + \frac{3}{17} = \frac{15 - 10 + 3}{17} = \frac{8}{17}$$ Ответ: $$rac{8}{17}$$ б) $$2\frac{5}{7} + 6\frac{3}{7} = (2 + 6) + (\frac{5}{7} + \frac{3}{7}) = 8 + \frac{8}{7} = 8 + 1\frac{1}{7} = 9\frac{1}{7}$$ Ответ: $$9\frac{1}{7}$$ в) $$8 - 2\frac{5}{6} = 8 - (2 + \frac{5}{6}) = 8 - 2 - \frac{5}{6} = 6 - \frac{5}{6} = 5\frac{6}{6} - \frac{5}{6} = 5\frac{1}{6}$$ Ответ: $$5\frac{1}{6}$$ г) $$4\frac{4}{11} - 2\frac{10}{11} = 4\frac{4}{11} - 2\frac{10}{11} = \frac{48}{11} - \frac{32}{11} = \frac{16}{11} = 1\frac{5}{11}$$ Ответ: $$1\frac{5}{11}$$