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Giải nhanh giúp đang cần gấp

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    Vì `x \vdots 8 , x \vdots 9`

    `⇒x∈BC(8,9)`

    Phân tích các số thành thừa số nguyên tố:

    `8=2³`

    `9=3²`

    `⇒BCNNNN(8,9)=2³.3²=72`

    `⇒BC(8,9)=B(72)={0;72;144;216;…}`

    `⇒x∈{0;72;144;216;…}`

    Mà `100≤x≤200`

    `⇒x=144`

    Vậy `x=144`

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