Вариант IV. Выполните сложение (1-2): 1. a) 3/11 + (-7/11); б) 6/13 + (-8/13); в) 8/17 + 11/17

a) \(\frac{3}{11} + \left(-\frac{7}{11}\right) = \frac{3-7}{11} = \frac{-4}{11} = -\frac{4}{11}\) б) \(\frac{6}{13} + \left(-\frac{8}{13}\right) = \frac{6-8}{13} = \frac{-2}{13} = -\frac{2}{13}\) в) \(\frac{8}{17} + \frac{11}{17} = \frac{8+11}{17} = \frac{19}{17}\)