89. Найдите значение выражения: а) 10 11/15 − 3 1/5 − 4 7/10; б) 12 7/12 − 4 1/8 − 4 1/3; в) 8 8/9 + 2 11/18 − 3 1/4; г) 14 7/24 − 8 1/16 − 5 1/6; д) 22 1/3 − (10 7/12 + 9 11/20); е) 10 − (5 7/8 + 3 5/12).

а) \(10\frac{11}{15}-3\frac{1}{5}-4\frac{7}{10}=10\frac{22}{30}-3\frac{6}{30}-4\frac{21}{30}=2\frac{25}{30}=2\frac{5}{6}\).

б) \(12\frac{7}{12}-4\frac{1}{8}-4\frac{1}{3}=12\frac{14}{24}-4\frac{3}{24}-4\frac{8}{24}=4\frac{3}{24}=4\frac{1}{8}\).

в) \(8\frac{8}{9}+2\frac{11}{18}-3\frac{1}{4}=8\frac{32}{36}+2\frac{22}{36}-3\frac{9}{36}=8\frac{45}{36}=9\frac{1}{4}-1=8\frac{1}{4}\).

г) \(14\frac{7}{24}-8\frac{1}{16}-5\frac{1}{6}=14\frac{14}{48}-8\frac{3}{48}-5\frac{8}{48}=1\frac{3}{48}=1\frac{1}{16}\).

д) \(22\frac{1}{3}-(10\frac{7}{12}+9\frac{11}{20})\).

\(10\frac{7}{12}+9\frac{11}{20}=19+\frac{35}{60}+\frac{33}{60}=20\frac{8}{60}=20\frac{2}{15}\).

\(22\frac{1}{3}-20\frac{2}{15}=22\frac{5}{15}-20\frac{2}{15}=2\frac{1}{5}\).

е) \(10-(5\frac{7}{8}+3\frac{5}{12})\).

\(5\frac{7}{8}+3\frac{5}{12}=8+\frac{35}{40}+\frac{25}{40}=9\frac{1}{2}\).

\(10-9\frac{1}{2}=\frac{1}{2}\).

Ответ: а) \(2\frac{5}{6}\); б) \(4\frac{1}{8}\); в) \(8\frac{1}{4}\); г) \(1\frac{1}{16}\); д) \(2\frac{1}{5}\); е) \(\frac{1}{2}\).