Ответ:

При делении на дробь умножаем на обратную дробь.

1.

  1. \(\frac{3}{4}:\frac{5}{7}=\frac{3}{4}\cdot\frac{7}{5}=\frac{21}{20}\);
  2. \(\frac{5}{18}:\frac{25}{27}=\frac{5}{18}\cdot\frac{27}{25}=\frac{3}{10}\);
  3. \(\frac{9}{16}:\frac{3}{64}=\frac{9}{16}\cdot\frac{64}{3}=12\);
  4. \(\frac{25}{72}:\frac{4}{63}=\frac{25}{72}\cdot\frac{63}{4}=\frac{175}{32}=5\frac{15}{32}\).

2.

  1. \(8:\frac{4}{5}=8\cdot\frac{5}{4}=10\);
  2. \(1:\frac{7}{16}=\frac{16}{7}=2\frac{2}{7}\);
  3. \(\frac{8}{15}:24=\frac{8}{15}\cdot\frac{1}{24}=\frac{1}{45}\).