làm dùm mình a,3/5.5/7.7/9.9/11….111/113 b.2/3.5/8.11/13…111/113

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1. a, $\frac{3}{5}$. $\frac{5}{7}$. $\frac{7}{9}$ $\frac{9}{11}$ ….$\frac{109}{111}$ . $\frac{111}{113}$ 

   =$\frac{3.5.7.9….109.111}{5.7.9.11….111.113}$ 

   =$\frac{3}{113}$ 

    

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