lam on huong dan e phuong phap giai bai tap nay. em cam on nhieu A = 55/11*16 + 55/16*21 + 55/ 21*26 + 55/ 26*31 + 55/ 31*36 + 55/ 36*41

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1. `A=55/(11xx16)+55/(16xx21)+55/(21xx26)+55/(26xx31)+55/(31xx36)+55/(36xx41)`

   `A=11xx(5/(11xx16)+5/(16xx21)+5/(21xx26)+5/(26xx31)+5/(31xx36)+5/(36xx41))`

   `A=11xx(1/11-1/16+1/16-1/21+1/21-1/26+1/26-1/31+1/31-1/36+1/36-1/41)`

   `A=11xx(1/11-1/41)`

   `A=11xx(41/(541)-11/(541))`

   `A=11xx30/451`

   `A=30/41`

   $\text{Vậy}$`A=30/41.`

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2. Đáp án:

   `A=30/41`

   Giải thích các bước giải:

   `A = 55/11.16 + 55/16.21 + 55/ 21.26 + 55/ 26.31 + 55/ 31.36 + 55/ 36.41`
   `A=11.(5/11.16+5/16.21+5/21.26+5/26.31+5/31.36+5/36.41)`
   `A=11.(1/11-1/16+1/16-1/21+1/21-1/26+1/26-1/31+1/31-1/36+1/36-1/41)`
   `A=11.(1/11-1/41)`
   `A=11.(41/451-11/451)`
   `A=11. 30/451`
   `A=30/41`
   Vậy `A=30/41`

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