- а) \(7\frac{5}{9}+3\frac{1}{2}=11\frac{1}{18}\); б) \(5\frac{2}{3}+\frac{3}{4}=6\frac{5}{12}\); в) \(7\frac{3}{8}+1\frac{5}{6}=9\frac{5}{24}\); г) \(8\frac{3}{5}+\frac{1}{15}=8\frac{2}{3}\).
- д) \(9\frac{5}{6}-2\frac{3}{4}=7\frac{1}{12}\); е) \(3\frac{7}{9}-\frac{4}{15}=3\frac{23}{45}\); ж) \(7\frac{5}{18}-1\frac{7}{12}=5\frac{23}{36}\); з) \(3\frac{3}{10}-1\frac{7}{15}=1\frac{17}{30}\).
- и) \(\frac{3}{8}\cdot\frac{4}{9}=\frac{1}{6}\); к) \(2\frac{1}{9}\cdot4=8\frac{4}{9}\); л) \(3\frac{3}{5}\cdot2\frac{1}{12}=7\frac{19}{30}\); м) \(4\frac{2}{7}\cdot2\frac{4}{5}=12\frac{8}{35}\).
- н) \(5:\frac{2}{5}=12\frac{1}{2}\); о) \(12:2\frac{1}{4}=5\frac{1}{3}\); п) \(1\frac{3}{5}:5\frac{1}{3}=\frac{3}{10}\); р) \(12\frac{1}{2}:3\frac{3}{4}=3\frac{1}{3}\).
Ответ: 11 1/18; 6 5/12; 9 5/24; 8 2/3; 7 1/12; 3 23/45; 5 23/36; 1 17/30; 1/6; 8 4/9; 7 19/30; 12 8/35; 12 1/2; 5 1/3; 3/10; 3 1/3.