Nhận nhanh với ạ Gấp lắm rồi

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Nhận nhanh với ạ
Gấp lắm rồi

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    `a)`

            `7/9+ 2/9 : 10/9`

    `=7/9 + 2/9 xx 9/10`

    `=7/9+ 2/10`

    `=7/9+1/5`

    `=(35+9)/45`

    `=44/45`

    `b)`

            `3/8 xx 8/15 + 7/15`

    `=3/15+ 7/15`

    `=10/15`

    `=2/3`

    `#` $Mpro$

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