$\frac{3}{7}$  ： $\frac{4}{13}$  =？

 $\frac{7}{13}：\frac{1}{3}=？$  

 $\frac{5}{9}：\frac{5}{8}=？$  

 $\frac{1}{3}：\frac{6}{11}=？$ 

 $\frac{3}{1}：\frac{2}{1}=？$  

 $\frac{5}{2}：\frac{2}{1}=？$  

 $\frac{9}{4}：\frac{2}{1}=？$  

 $\frac{11}{4}：\frac{2}{3}=？$ 

 $\frac{5}{3}：\frac{11}{5}=？$