447. Выполните деление: 1) 11/15 : 3/8; 2) 6/35 : 18/25; 3) 12/55 : 48/77; 4) 21/40 : 3/4; 5) 27/50 : 9/25; 6) 63/64 : 45/56; 7) 5/8 : 5/32; 8) 14/55 : 1/5.

Деление заменяем умножением на обратную дробь и сокращаем результат.

1. \(\frac{11}{15}:\frac{3}{8}=\frac{11}{15}\cdot\frac{8}{3}=\frac{88}{45}\).
2. \(\frac{6}{35}:\frac{18}{25}=\frac{6}{35}\cdot\frac{25}{18}=\frac{5}{21}\).
3. \(\frac{12}{55}:\frac{48}{77}=\frac{12}{55}\cdot\frac{77}{48}=\frac{7}{20}\).
4. \(\frac{21}{40}:\frac{3}{4}=\frac{21}{40}\cdot\frac{4}{3}=\frac{7}{10}\).
5. \(\frac{27}{50}:\frac{9}{25}=\frac{27}{50}\cdot\frac{25}{9}=\frac{3}{2}\).
6. \(\frac{63}{64}:\frac{45}{56}=\frac{63}{64}\cdot\frac{56}{45}=\frac{49}{40}\).
7. \(\frac{5}{8}:\frac{5}{32}=\frac{5}{8}\cdot\frac{32}{5}=4\).
8. \(\frac{14}{55}:\frac{1}{5}=\frac{14}{55}\cdot5=\frac{14}{11}\).

Ответ: 1) 88/45; 2) 5/21; 3) 7/20; 4) 7/10; 5) 3/2; 6) 49/40; 7) 4; 8) 14/11.