rút gọn rồi quy đồng A=3469-54/6938-108 B=2469-98/3702-147

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1. `A={3469-54}/{6938-108}=3415/6830=1/2`
   

   `B={2469-98}/{3702-147}=2371/3555`
   

   `MC: 7110`
   

   `A=1/2={1.3555}/{2.3555}=3555/7110`
   

   `B=2371/3555={2371.2}/{3555.2}=4742/7110`

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2. A=3469-54/6938-108

   A=3415/6830

   A=3415:3415/6830:3415

   A= 1/2

    B=2469-89/3702-147

   B=2380/3555

   B=476/711

   A=1.711/2.711

   A=711/1422

   B=476.2/711.2

   B=952/1422

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