233. Выполните вычитание: ж) -5\frac{3}{28} + 4\frac{5}{12};

ж) -5\frac{3}{28} + 4\frac{5}{12} = -\frac{5*28 + 3}{28} + \frac{4*12 + 5}{12} = -\frac{143}{28} + \frac{53}{12} = -\frac{143*3}{28*3} + \frac{53*7}{12*7} = -\frac{429}{84} + \frac{371}{84} = \frac{-429 + 371}{84} = \frac{-58}{84} = -\frac{29}{42}