г) -\frac{2}{9} + (-\frac{5}{6}); д) 2\frac{9}{11} + (-3\frac{7}{22}).

Ответ:

1. -\frac{2}{9} + (-\frac{5}{6}) = -\frac{2}{9} - \frac{5}{6} = -\frac{2\cdot2}{9\cdot2} - \frac{5\cdot3}{6\cdot3} = -\frac{4}{18} - \frac{15}{18} = -\frac{19}{18} = -1\frac{1}{18}
2. 2\frac{9}{11} + (-3\frac{7}{22}) = \frac{31}{11} - \frac{73}{22} = \frac{31\cdot2}{11\cdot2} - \frac{73}{22} = \frac{62}{22} - \frac{73}{22} = -\frac{11}{22} = -\frac{1}{2}

Ответ: -1 1/18; -1/2