chứng tỏ rằng: A=-2^1-2^2-2^3-…-2^99-2^100 -2^1 là âm hai mũ 1 nhé

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1. `A=-2^1-2^2-2^3-…-2^99-2^100`

   `A=-(2^1+2^2+2^3+…+2^100)`

   `2A=-(2^2+2^3+2^4+…+2^101)`

   `2A-A=-(2^2+2^3+2^4+…+2^101)-[-(2^1+2^2+2^3+…+2^100)]`

   `A=-2^2-2^3-2^4-…-2^99-2^100-2^101+2^1+2^2+2^3+…+2^100`

   `A=-2^101+2^1`

   `A=2-2^101`

   `⇒A ∈ Z`

    

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