ж) -5\(\frac{3}{28}\) + 4\(\frac{5}{12}\);

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