cmr 3^4n+1 chia hết cho 5

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cmr 3^4n+1 chia hết cho 5

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Jezebel 4 years 2020-11-05T15:53:05+00:00 1 Answers 79 views 0

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  1. Orla
    0
    2020-11-05T15:54:28+00:00
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     `3^(4n)=(3^4)^n=81^n=(…1)`

    `=> 3^(4n)-1=(…0) \vdots 5`

    Nhầm đề ko thees?

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