233. Выполните вычитание: д) 3/7 - 4; e) -11/12 - (-8/9); ж) -5/28 + 4 3/12

д) \(\frac{3}{7} - 4 = \frac{3}{7} - \frac{28}{7} = \frac{3-28}{7} = \frac{-25}{7} = -3 \frac{4}{7}\) е) \(-\frac{11}{12} - (-\frac{8}{9}) = -\frac{11}{12} + \frac{8}{9} = \frac{-33+32}{36} = -\frac{1}{36}\) ж) \(-\frac{5}{28} + 4 \frac{3}{12}\) = \(-\frac{5}{28} + \frac{48+3}{12}\) = \(-\frac{5}{28} + \frac{51}{12}\) = \(-\frac{5}{28} + \frac{17}{4}\) = \(\frac{-5+119}{28}\) = \(\frac{114}{28}\) = \(\frac{57}{14}\) = \(4 \frac{1}{14}\)