[tex]a). \frac{ \frac{1}{11} }{2} = \frac{1}{11} :2= \frac{1}{11} * \frac{1}{2} = \frac{1}{22} \\ \\ b).\frac{ \frac{1}{11} }{2} = \frac{1}{11} :2= \frac{1}{11} * \frac{1}{2} = \frac{1}{22} \\ \\ c). \frac{ \frac{1}{7} }{ \frac{3}{4} }= \frac{1}{7} : \frac{3}{4} = \frac{1}{7} * \frac{4}{3} = \frac{4}{21} [/tex]
[tex]d). \frac{3 \frac{1}{7} }{ \frac{11}{21} } = \frac{ \frac{3*7+1}{7} }{ \frac{11}{21} } = \frac{ \frac{22}{7} }{ \frac{11}{21} } = \frac{22}{7} : \frac{11}{21} = \frac{22}{7} * \frac{21}{11} = \frac{462}{77} =6[/tex]