`\color{#F5F5F5}{k}\color{#DCDCDC}{e}\color{#808080}{v}\color{#2B2B2B}{u}\color{#000000}{u}\color{#000000000000}{.}`

Ta có:

`B/A = ( 2023/1 + 2022/2 + 2021/3 + ... + 2/2022 + 1/2023)/(1/2 + 1/3 +...+ 1/2024)`

`=((2023/1) + (2022/2) + (2021/3) + ... + (2/2022) + (1/2023))/(1/2 + 1/3 +...+ 1/2024)`

`=((2022/2 + 1) + (2021/3 + 1) + ... + (2/2022 + 1) + (1/2023))/ (1/2 + 1/3 +...+ 1/2024)`

`= ((2024/2) + (2024/3) + (2024/4) + ... + (2024/2023) + (2024/2024))/(1/2 + 1/3 +...+ 1/2024)`

`=  (2024 * (1/2 + 1/3 + ... + 1/2023 + 1/2024))/(1/2 + 1/3 +...+ 1/2024)`

`= 2024`