1. Вычислите: а) 2/15 + 4/15; б) 4/3 − 2/11; в) 11/12 − 23/60; г) 17/51 + 11/33; д) 1 − 5/8; е) 10 − 1 1/9; ж) 9 5/6 − 2 3/4; з) 8 1/4 − 3 1/3; и) 3,3 − 1 7/15; к) 5 3/24 − 1 1/21.

1. а) \(\frac{2}{15}+\frac{4}{15}=\frac{6}{15}=\frac{2}{5}\).
2. б) \(\frac{4}{3}-\frac{2}{11}=\frac{44}{33}-\frac{6}{33}=\frac{38}{33}=1\frac{5}{33}\).
3. в) \(\frac{11}{12}-\frac{23}{60}=\frac{55}{60}-\frac{23}{60}=\frac{32}{60}=\frac{8}{15}\).
4. г) \(\frac{17}{51}+\frac{11}{33}=\frac{17}{51}+\frac{17}{51}=\frac{34}{51}=\frac{2}{3}\).
5. д) \(1-\frac{5}{8}=\frac{8}{8}-\frac{5}{8}=\frac{3}{8}\).
6. е) \(10-1\frac{1}{9}=9-\frac{1}{9}=8\frac{8}{9}\).
7. ж) \(9\frac{5}{6}-2\frac{3}{4}=7+\frac{10}{12}-\frac{9}{12}=7\frac{1}{12}\).
8. з) \(8\frac{1}{4}-3\frac{1}{3}=5+\frac{3}{12}-\frac{4}{12}=4\frac{11}{12}\).
9. и) \(3,3-1\frac{7}{15}=3\frac{3}{10}-1\frac{7}{15}=3\frac{9}{30}-1\frac{14}{30}=1\frac{25}{30}=1\frac{5}{6}\).
10. к) \(5\frac{3}{24}-1\frac{1}{21}=4+\frac{1}{8}-\frac{1}{21}=4+\frac{21-8}{168}=4\frac{13}{168}\).

Ответ: а) \(\frac{2}{5}\); б) \(1\frac{5}{33}\); в) \(\frac{8}{15}\); г) \(\frac{2}{3}\); д) \(\frac{3}{8}\); е) \(8\frac{8}{9}\); ж) \(7\frac{1}{12}\); з) \(4\frac{11}{12}\); и) \(1\frac{5}{6}\); к) \(4\frac{13}{168}\).