3 : (\frac{1}{9} = 3 \cdot \frac{9}{1} = 27)6 : (\frac{1}{11} = 6 \cdot \frac{11}{1} = 66)4 : (\frac{3}{8} = 4 \cdot \frac{8}{3} = \frac{32}{3})5 : (\frac{5}{7} = 5 \cdot \frac{7}{5} = 7)9 : (\frac{3}{7} = 9 \cdot \frac{7}{3} = 21)10 : (\frac{5}{8} = 10 \cdot \frac{8}{5} = 16)2 : 1 = 2(\frac{1}{3} = \frac{1}{3})12 : 2 = 6(\frac{1}{7} = \frac{1}{7})