So sánh A=2020/2021 + 2021/2022 B=2020+2021/2021+2022

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1. `B= (2020+2021)/(2021+2022)`

   `⇒B= 2020/(2021+2022) + 2021/(2021+2022)`

   `mà : 2020/2021>2020/(2021+2022)`

   `2021/2022>2021/(2021+2022)`

   `⇒ 2020/2021 + 2021/2022 > 2020/(2021+2022) + 2021/(2021+2022)`

   `⇒ 2020/2021 + 2021/2022>(2020+2021)/(2021+2022)`

   `⇒ A>B`

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2. Đáp án + Giải thích các bước giải:

   `A=2020/2021+2021/2022>2020/2022+2021/2022=(2020+2021)/(2022)>(2020+2021)/(2021+2022)=B`

   Vậy `A>B`

    

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