17. Действуем по правилу. Найдите сумму или разность: а) 5/24 + 3/8; б) 7/10 − 2/5; в) 2/3 + 7/8; г) 3/4 − 1/6; д) 8/25 + 17/20; е) 5/6 + 1/9; ж) 4/45 − 1/30; з) 17/12 − 11/12; к) 11/15 + 5/12; л) 3/3 + 1/6; м) 3/4 − 2/5.

1. \(\frac{5}{24}+\frac{3}{8}=\frac{5}{24}+\frac{9}{24}=\frac{14}{24}=\frac{7}{12}\).
2. \(\frac{7}{10}-\frac{2}{5}=\frac{7}{10}-\frac{4}{10}=\frac{3}{10}\).
3. \(\frac{2}{3}+\frac{7}{8}=\frac{16}{24}+\frac{21}{24}=\frac{37}{24}=1\frac{13}{24}\).
4. \(\frac{3}{4}-\frac{1}{6}=\frac{9}{12}-\frac{2}{12}=\frac{7}{12}\).
5. \(\frac{8}{25}+\frac{17}{20}=\frac{32}{100}+\frac{85}{100}=\frac{117}{100}=1\frac{17}{100}\).
6. \(\frac{5}{6}+\frac{1}{9}=\frac{15}{18}+\frac{2}{18}=\frac{17}{18}\).
7. \(\frac{4}{45}-\frac{1}{30}=\frac{8}{90}-\frac{3}{90}=\frac{5}{90}=\frac{1}{18}\).
8. \(\frac{17}{12}-\frac{11}{12}=\frac{6}{12}=\frac{1}{2}\).
9. \(\frac{11}{15}+\frac{5}{12}=\frac{44}{60}+\frac{25}{60}=\frac{69}{60}=\frac{23}{20}=1\frac{3}{20}\).
10. \(\frac{3}{3}+\frac{1}{6}=1+\frac{1}{6}=1\frac{1}{6}\).
11. \(\frac{3}{4}-\frac{2}{5}=\frac{15}{20}-\frac{8}{20}=\frac{7}{20}\).

Ответ: а) \(\frac{7}{12}\); б) \(\frac{3}{10}\); в) \(1\frac{13}{24}\); г) \(\frac{7}{12}\); д) \(1\frac{17}{100}\); е) \(\frac{17}{18}\); ж) \(\frac{1}{18}\); з) \(\frac{1}{2}\); к) \(1\frac{3}{20}\); л) \(1\frac{1}{6}\); м) \(\frac{7}{20}\).