a) \(\frac{7}{9} : \frac{7}{18} = \frac{7}{9} \cdot \frac{18}{7} = 2\)
б) \(\frac{1}{4} : \frac{1}{3} = \frac{1}{4} \cdot \frac{3}{1} = \frac{3}{4}\)
в) \(\frac{3}{4} : \frac{7}{9} = \frac{3}{4} \cdot \frac{9}{7} = \frac{27}{28}\)
г) \(\frac{3}{7} : \frac{1}{14} = \frac{3}{7} \cdot \frac{14}{1} = 6\)
д) \(\frac{6}{11} : 6 = \frac{6}{11} \cdot \frac{1}{6} = \frac{1}{11}\)
е) \(\frac{9}{13} : 3 = \frac{9}{13} \cdot \frac{1}{3} = \frac{3}{13}\)
ж) \(\frac{5}{7} : \frac{1}{7} = \frac{5}{7} \cdot \frac{7}{1} = 5\)
з) \(\frac{15}{22} : 5 = \frac{15}{22} \cdot \frac{1}{5} = \frac{3}{22}\)