Question

Answer 1

`=2023.(2/[1.3]+2/[3.5]+2/[5.7]+....+2/[2019+2021]+2/[2021+2023])`

`=2023.(1-1/3+1/3-1/5+1/5-1/7+.....+1/2019-1/2021+1/2021-1/2023)`

`=2023.(1-1/2023)`

`=2023. 2022/2023=2022`

Hình như đề sai thì phải, xin phép sửa đề =)

Answer 2

có sai đề ko z :v?

Answer 3

=4046/1-4046/3+4046/3-4046/5+.....+4046/2019-2021+4046/2021-4046/2023

=4046-2

=4044