Ответ:
Чтобы разделить на дробь, умножаем на обратную дробь.
- а) \(\frac{3}{8}:\frac{5}{7}=\frac{3}{8}\cdot\frac{7}{5}=\frac{21}{40}\).
- б) \(\frac{1}{5}:\frac{3}{4}=\frac{1}{5}\cdot\frac{4}{3}=\frac{4}{15}\).
- в) \(\frac{4}{5}:\frac{4}{7}=\frac{4}{5}\cdot\frac{7}{4}=\frac{7}{5}=1\frac{2}{5}\).
- г) \(\frac{3}{16}:\frac{5}{12}=\frac{3}{16}\cdot\frac{12}{5}=\frac{9}{20}\).
- д) \(\frac{3}{5}:\frac{9}{25}=\frac{3}{5}\cdot\frac{25}{9}=\frac{5}{3}=1\frac{2}{3}\).
- е) \(\frac{7}{8}:2=\frac{7}{8}\cdot\frac{1}{2}=\frac{7}{16}\).
- ж) \(\frac{3}{8}:3=\frac{3}{8}\cdot\frac{1}{3}=\frac{1}{8}\).
- з) \(5:\frac{2}{5}=5\cdot\frac{5}{2}=\frac{25}{2}=12\frac{1}{2}\).
- и) \(8:\frac{4}{5}=8\cdot\frac{5}{4}=10\).
- к) \(\frac{3}{7}:\frac{1}{2}=\frac{3}{7}\cdot2=\frac{6}{7}\).
- л) \(3\frac{1}{2}:\frac{2}{3}=\frac{7}{2}\cdot\frac{3}{2}=\frac{21}{4}=5\frac{1}{4}\).
- м) \(4\frac{1}{2}:1\frac{1}{2}=\frac{9}{2}:\frac{3}{2}=\frac{9}{2}\cdot\frac{2}{3}=3\).
- н) \(1\frac{2}{3}:1\frac{1}{10}=\frac{5}{3}:\frac{11}{10}=\frac{5}{3}\cdot\frac{10}{11}=\frac{50}{33}=1\frac{17}{33}\).
- о) \(10\frac{1}{3}:2\frac{2}{3}=\frac{31}{3}:\frac{8}{3}=\frac{31}{3}\cdot\frac{3}{8}=\frac{31}{8}=3\frac{7}{8}\).
- п) \(4\frac{3}{4}:3=\frac{19}{4}\cdot\frac{1}{3}=\frac{19}{12}=1\frac{7}{12}\).
- р) \(1:\frac{3}{11}=1\cdot\frac{11}{3}=\frac{11}{3}=3\frac{2}{3}\).
- с) \(0:5\frac{1}{18}=0\).
- т) \(3\frac{1}{4}:1=3\frac{1}{4}\).
- у) \(3\frac{1}{4}:1=3\frac{1}{4}\).
- ф) \(3\frac{7}{39}:1\frac{5}{31}=\frac{124}{39}:\frac{36}{31}=\frac{124}{39}\cdot\frac{31}{36}=\frac{961}{351}=2\frac{259}{351}\).
Ответ: а) \(\frac{21}{40}\); б) \(\frac{4}{15}\); в) \(1\frac{2}{5}\); г) \(\frac{9}{20}\); д) \(1\frac{2}{3}\); е) \(\frac{7}{16}\); ж) \(\frac{1}{8}\); з) \(12\frac{1}{2}\); и) \(10\); к) \(\frac{6}{7}\); л) \(5\frac{1}{4}\); м) \(3\); н) \(1\frac{17}{33}\); о) \(3\frac{7}{8}\); п) \(1\frac{7}{12}\); р) \(3\frac{2}{3}\); с) \(0\); т) \(3\frac{1}{4}\); у) \(3\frac{1}{4}\); ф) \(2\frac{259}{351}\).
