Выполните деление дробей.

1) \( \frac{3}{4} \div \frac{5}{7} = \frac{3}{4} \cdot \frac{7}{5} = \frac{3 \cdot 7}{4 \cdot 5} = \frac{21}{20} \). 2) \( \frac{5}{18} \div \frac{25}{27} = \frac{5}{18} \cdot \frac{27}{25} = \frac{5 \cdot 27}{18 \cdot 25} = \frac{135}{450} = \frac{3}{10} \). 3) \( \frac{9}{16} \div \frac{3}{64} = \frac{9}{16} \cdot \frac{64}{3} = \frac{9 \cdot 64}{16 \cdot 3} = \frac{576}{48} = 12 \). 4) \( \frac{25}{72} \div \frac{45}{63} = \frac{25}{72} \cdot \frac{63}{45} = \frac{25 \cdot 63}{72 \cdot 45} = \frac{1575}{3240} = \frac{35}{72} \).