58. Выполните действия: 1) 5 7/8 − 2 2/3 + 4 5/6; 2) 6 8/15 + 4 5/18 − 3,6; 3) (43 7/18 − 5 2/9) − 12 8/27; 4) (31 − 14 7/15) − (27 2/3 − 19 3/4).

1. \(5\frac{7}{8}-2\frac{2}{3}+4\frac{5}{6}=5\frac{21}{24}-2\frac{16}{24}+4\frac{20}{24}=8\frac{1}{24}\).
2. \(3{,}6=3\frac{3}{5}\). Тогда \(6\frac{8}{15}+4\frac{5}{18}-3\frac{3}{5}=7\frac{19}{90}\).
3. \(43\frac{7}{18}-5\frac{2}{9}=38\frac{1}{6}\). Далее \(38\frac{1}{6}-12\frac{8}{27}=24\frac{47}{54}\).
4. \(31-14\frac{7}{15}=16\frac{8}{15}\), а \(27\frac{2}{3}-19\frac{3}{4}=6\frac{11}{12}\). Поэтому \(16\frac{8}{15}-6\frac{11}{12}=9\frac{37}{60}\).

Ответ: 1) \(8\frac{1}{24}\); 2) \(7\frac{19}{90}\); 3) \(24\frac{47}{54}\); 4) \(9\frac{37}{60}\).