2) Упростим выражение:
$$8\frac{13}{18}m-4\frac{7}{12}m+5\frac{5}{6}m = (8\frac{13}{18}-4\frac{7}{12}+5\frac{5}{6})m = (8 + \frac{13}{18} - 4 - \frac{7}{12} + 5 + \frac{5}{6})m = (8 - 4 + 5 + \frac{13}{18} - \frac{7}{12} + \frac{5}{6})m = (9 + \frac{26}{36} - \frac{21}{36} + \frac{30}{36})m = (9 + \frac{26 - 21 + 30}{36})m = (9 + \frac{35}{36})m = 9\frac{35}{36}m$$
Ответ: $$9\frac{35}{36}m$$