58. Выполните действия: 1) $$5\frac{7}{8}-2\frac{2}{3}+4\frac{5}{6}$$; 2) $$6\frac{8}{15}+4\frac{5}{18}-3,6$$; 3) $$(43\frac{7}{18}-5\frac{2}{9})-12\frac{8}{27}$$; 4) $$(31\frac{7}{15}-14\frac{7}{15})-(27\frac{2}{3}-19\frac{3}{4})$$

1) $$5\frac{7}{8}-2\frac{2}{3}+4\frac{5}{6} = \frac{47}{8} - \frac{8}{3} + \frac{29}{6} = \frac{141-64+58}{24} = \frac{135}{24} = \frac{45}{8} = 5\frac{5}{8}$$; 2) $$6\frac{8}{15}+4\frac{5}{18}-3,6 = \frac{98}{15} + \frac{77}{18} - \frac{36}{10} = \frac{98}{15} + \frac{77}{18} - \frac{18}{5} = \frac{588+385-324}{90} = \frac{649}{90} = 7\frac{19}{90}$$; 3) $$(43\frac{7}{18}-5\frac{2}{9})-12\frac{8}{27} = (\frac{781}{18} - \frac{47}{9}) - \frac{332}{27} = (\frac{781}{18} - \frac{94}{18}) - \frac{332}{27} = \frac{687}{18} - \frac{332}{27} = \frac{229}{6} - \frac{332}{27} = \frac{2061-664}{54} = \frac{1397}{54} = 25\frac{47}{54}$$; 4) $$(31\frac{7}{15}-14\frac{7}{15})-(27\frac{2}{3}-19\frac{3}{4}) = (\frac{472}{15} - \frac{217}{15}) - (\frac{83}{3} - \frac{79}{4}) = \frac{255}{15} - (\frac{332-237}{12}) = 17 - \frac{95}{12} = \frac{204-95}{12} = \frac{109}{12} = 9\frac{1}{12}$$