15. Выполните сложение или вычитание: 7/48 + 11/36; 26/45 − 16/30; 13/18 − 5/24; 1 + 3/8; 2 − 5/6; 2 + 3/5; 3 − 10/17; 22 11/15 − 22; 12 9/25 + 7 32/50; 5 3/20 − 4 7/10; 11 1/4 + 3 7/10; 40 3/16 − 21 5/8; 5 3/14 − 4 5/7; 5/13 + 7/26; 11/63 − 1/9; 12/15 − 3/5; 5 + 4/9; 4 − 7/11; 2 + 4/7; 5 − 12/15; 3 11/12 − 10; 15 7/24 + 8 1/3; 2 4/15 − 2 1/30; 12 1/5 + 2 5/10; 9 1/4 − 7 1/2; 1 5/17 + 3 9/34; 7/12 + 4/36; 15/27 − 1/9; 11/14 − 1/7; 4 + 2/7; 5 − 4/9; 6 + 2/3; 10 − 15/21; 15 1/7 − 5; 16 2/9 + 2 1/18; 3 4/17 − 2 1/34; 4 2/3 + 3 4/15; 10 5/8 − 4 11/16; 2 1/6 + 5 1/3.

При сложении и вычитании дробей приводим их к общему знаменателю. В смешанных числах отдельно учитываем целую и дробную части; если при вычитании дробной части не хватает, занимаем единицу из целой части.

1. \(\frac{7}{48}+\frac{11}{36}=\frac{21}{144}+\frac{44}{144}=\frac{65}{144}\).
2. \(\frac{26}{45}-\frac{16}{30}=\frac{26}{45}-\frac{24}{45}=\frac{2}{45}\).
3. \(\frac{13}{18}-\frac{5}{24}=\frac{52}{72}-\frac{15}{72}=\frac{37}{72}\).
4. \(1+\frac{3}{8}=1\frac{3}{8}\).
5. \(2-\frac{5}{6}=1\frac{1}{6}\).
6. \(2+\frac{3}{5}=2\frac{3}{5}\).
7. \(3-\frac{10}{17}=2\frac{7}{17}\).
8. \(22\frac{11}{15}-22=\frac{11}{15}\).
9. \(12\frac{9}{25}+7\frac{32}{50}=12\frac{9}{25}+7\frac{16}{25}=20\).
10. \(5\frac{3}{20}-4\frac{7}{10}=4\frac{23}{20}-4\frac{14}{20}=\frac{9}{20}\).
11. \(11\frac{1}{4}+3\frac{7}{10}=14\frac{19}{20}\).
12. \(40\frac{3}{16}-21\frac{5}{8}=39\frac{19}{16}-21\frac{10}{16}=18\frac{9}{16}\).
13. \(5\frac{3}{14}-4\frac{5}{7}=4\frac{17}{14}-4\frac{10}{14}=\frac{1}{2}\).
14. \(\frac{5}{13}+\frac{7}{26}=\frac{10}{26}+\frac{7}{26}=\frac{17}{26}\).
15. \(\frac{11}{63}-\frac{1}{9}=\frac{11}{63}-\frac{7}{63}=\frac{4}{63}\).
16. \(\frac{12}{15}-\frac{3}{5}=\frac{4}{5}-\frac{3}{5}=\frac{1}{5}\).
17. \(5+\frac{4}{9}=5\frac{4}{9}\).
18. \(4-\frac{7}{11}=3\frac{4}{11}\).
19. \(2+\frac{4}{7}=2\frac{4}{7}\).
20. \(5-\frac{12}{15}=5-\frac{4}{5}=4\frac{1}{5}\).
21. \(3\frac{11}{12}-10=-6\frac{1}{12}\).
22. \(15\frac{7}{24}+8\frac{1}{3}=23\frac{15}{24}=23\frac{5}{8}\).
23. \(2\frac{4}{15}-2\frac{1}{30}=\frac{8}{30}-\frac{1}{30}=\frac{7}{30}\).
24. \(12\frac{1}{5}+2\frac{5}{10}=14\frac{7}{10}\).
25. \(9\frac{1}{4}-7\frac{1}{2}=1\frac{3}{4}\).
26. \(1\frac{5}{17}+3\frac{9}{34}=4\frac{19}{34}\).
27. \(\frac{7}{12}+\frac{4}{36}=\frac{21}{36}+\frac{4}{36}=\frac{25}{36}\).
28. \(\frac{15}{27}-\frac{1}{9}=\frac{5}{9}-\frac{1}{9}=\frac{4}{9}\).
29. \(\frac{11}{14}-\frac{1}{7}=\frac{9}{14}\).
30. \(4+\frac{2}{7}=4\frac{2}{7}\).
31. \(5-\frac{4}{9}=4\frac{5}{9}\).
32. \(6+\frac{2}{3}=6\frac{2}{3}\).
33. \(10-\frac{15}{21}=10-\frac{5}{7}=9\frac{2}{7}\).
34. \(15\frac{1}{7}-5=10\frac{1}{7}\).
35. \(16\frac{2}{9}+2\frac{1}{18}=18\frac{5}{18}\).
36. \(3\frac{4}{17}-2\frac{1}{34}=1\frac{7}{34}\).
37. \(4\frac{2}{3}+3\frac{4}{15}=7\frac{14}{15}\).
38. \(10\frac{5}{8}-4\frac{11}{16}=9\frac{26}{16}-4\frac{11}{16}=5\frac{15}{16}\).
39. \(2\frac{1}{6}+5\frac{1}{3}=7\frac{1}{2}\).