[tex]1) \frac{6}{11} : \frac{9}{22} = \frac{6}{11} * \frac{11}{6} = \frac{66}{66} = 1; 2) \frac{12}{13} : \frac{4}{39} = \frac{12}{13} * \frac{39}{4} = \frac{468}{52} = 9 ;3) \frac{2}{3} :\frac{1}{6}= \frac{2}{3}* \frac{6}{1} = \frac{12}{3} = 4[/tex]