B=1/120 – 2/30.33 – 2/33.36 – … – 2/117.120

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1. Đáp án + Giải thích các bước giải:

   `B=1/120 – 2/30.33 – 2/33.36 – …  – 2/117.120`
   

   `B=1/120-2/3(3/30.33 + 3/33.36 +3/36.39 …  + 2/117.120)`
   

   `B=1/120-2/3(1/30-1/33+1/33-1/36+1/36-1/39+…+1/117-1/120)`
   

   `B=1/120-2/3(1/30-1/120)`
   

   `B=1/120-2/3(4/120-1/120)`
   

   `B=1/120-2/3. 1/40`
   

   `B=1/120-1/60`
   

   `B=1/120-2/120`
   

   `B=(-1)/120`
   

   Vậy `B=(-1)/120`

    

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