Giải thích các bước giải:
Ta có :
• `A=2019/2020+2020/2021+2021/2022`
• `B=(2019+2020+2021)/(2020+2021+2022)`
`=2019/(2020+2021+2022)+2020/(2020+2021+2022)+2021/(2020+2021+2022)`
Do `+)2019/2020>2019/(2020+2021+2022)`
`+)2020/2021>2020/(2020+2021+2022)`
`+)2021/2022>2021/(2020+2021+2022)`
Nên : `2019/2020+2020/2021+2021/2022>2019/(2020+2021+2022)+2020/(2020+2021+2022)+2021/(2020+2021+2022)`
Hay `A>B`