B=2^ 2023 +(2^ 2022 +2^ 2021 +2^ -2020++ 2 ^ 2 + 2 ^ 1 + 1)

`B = 2^2023 + (2^2022 + 2^2021 + 2^2020 + ... + 2^2 + 2^1 + 1)`

`=> B = 1 + 2^1 + 2^2 + ... + 2^2022 + 2^2023`

`=> 2B = 2^1 + 2^2 + 2^3 + ... + 2^2023 + 2^2024`

`=> 2B - B = ( 2^1 + 2^2 + 2^3 + ... + 2^2023 + 2^2024) - ( 1 + 2^1 + 2^2 + ... + 2^2022 + 2^2023)`

`=> B = 2^2024 - 1`

Vậy `B = 2^2024 -1`

`#dtkc`