nhờ các anh chị cíu emmmm (trl cho e cả 2 câu nhanh vs ạ)

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nhờ các anh chị cíu emmmm (trl cho e cả 2 câu nhanh vs ạ)

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    Đáp án+Giải thích các bước giải:

     `a)`

    `\frac{2}{2021}+\frac{-5}{2022}+\frac{-1}{2021}+\frac{4}{2022}`

    `=(\frac{2}{2021}-\frac{1}{2021})+(\frac{-5}{2022}+\frac{4}{2022})`

    `=1/2021+(-1/2022)`

    `=\frac{2022}{2021.2022}-\frac{2021}{2021.2022}`

    `=\frac{2022-2021}{2021.2022}`

    `=\frac{1}{4086462}`

    `b)`

    `1+\frac{1}{-2}-5-\frac{-3}{4}`

    `=1-1/2-5+3/4`

    `=(1-5)+(3/4-1/2)`

    `=(-4)+(3/4-2/4)`

    `=-4+1/4`

    `=-16/4+1/4`

    `=-15/4`

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