c=1-2+2^2-2^3+2^4-……..+2^2022

1 bình luận về “c=1-2+2^2-2^3+2^4-……..+2^2022”

1. a ) C = 1 – 2  + 2^2 – 2^3 + … – 2^2021 + 2^2022

   => 2C = 2 – 2^2 + 2^3 – 2^4 + 2^5 – … – 2^2022 + 2^2023

   => 2C + C = ( 2 – 2^2 + 2^3 – 2^4 + … – 2^2022 + 2^2023 ) + ( 1 – 2 + 2^2 – 2^3 – … – 2^2021 + 2^2022 )

   => 3C = 2^2023 + 1

   => C = {2^2023 + 1}/3

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