6. Выполните сложение: a) -1/6 + 2/3 б) 4/5 + (-1/10) в) 5/9 + (-1/3)

a) \(-\frac{1}{6} + \frac{2}{3} = -\frac{1}{6} + \frac{4}{6} = \frac{3}{6} = \frac{1}{2}\) б) \(\frac{4}{5} + \left(-\frac{1}{10}\right) = \frac{8}{10} - \frac{1}{10} = \frac{7}{10}\) в) \(\frac{5}{9} + \left(-\frac{1}{3}\right) = \frac{5}{9} - \frac{3}{9} = \frac{2}{9}\)