Tính A = 2022 + 2020 + 2018 + 2016 + …. + 2 – 2019 – 2017 – 2015 – … – 1.

A = 2022 + 2020 + 2018 + 2016 + …. + 2 – 2019 – 2017 – 2015 – … – 1

A = (2022 − 2021) + (2020 − 2019) + (2018 − 2017) + ...+ (2 – 1 )

= 1+ 1 + 1 +... + 1

= 1 . 1011

= 1011.