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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: cmr: (3^2012)-9 chia hết cho 13

Toán Lớp 7: cmr: (3^2012)-9 chia hết cho 13

Comments ( 1 )

  1. Ta có:
    3^3 = 27 ≡ 1 (mod 13)
    → 3^2010 = (3^3)^670 ≡ 1 (mod 13)
    ⇒ 3^2012 = 3^2010 . 2^3 ≡ 9 (mod 13)
    Vậy: 3^2012 – 9 \vdots 13
     

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222-9+11+12:2*14+14 = ? ( )

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