58. Выполните действия: 1) 6 7/8 − 3 1/3 + 5 5/16; 2) 5 9/14 − 2 3/7 + 6,7; 3) (15 5/6 − 9 25/27) − 2 17/18; 4) (18 − 10 5/9) − (6 1/8 − 3 2/3).

1. Приведём дроби к знаменателю 48: \(6\frac{7}{8}=6\frac{42}{48}\), \(3\frac{1}{3}=3\frac{16}{48}\), \(5\frac{5}{16}=5\frac{15}{48}\).
   \(6\frac{42}{48}-3\frac{16}{48}+5\frac{15}{48}=8\frac{41}{48}\).
2. \(2\frac{3}{7}=2\frac{6}{14}\), поэтому \(5\frac{9}{14}-2\frac{6}{14}=3\frac{3}{14}\).
   \(6,7=6\frac{7}{10}\), тогда \(3\frac{3}{14}+6\frac{7}{10}=9\frac{26}{35}\).
3. \(15\frac{5}{6}=15\frac{135}{162}\), \(9\frac{25}{27}=9\frac{150}{162}\), \(2\frac{17}{18}=2\frac{153}{162}\).
   \(15\frac{135}{162}-9\frac{150}{162}=5\frac{147}{162}=5\frac{49}{54}\).
   \(5\frac{49}{54}-2\frac{17}{18}=3\frac{49}{54}-\frac{51}{54}=3\frac{25}{27}\).
4. \(18-10\frac{5}{9}=7\frac{4}{9}\).
   \(6\frac{1}{8}-3\frac{2}{3}=2\frac{11}{24}\).
   \(7\frac{4}{9}-2\frac{11}{24}=4\frac{29}{72}\).

Ответ: 1) \(8\frac{41}{48}\); 2) \(9\frac{26}{35}\); 3) \(3\frac{25}{27}\); 4) \(4\frac{29}{72}\).