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

Toán Lớp 6: Chứng minh rằng 2^17+2^14 chia hết cho 9

Toán Lớp 6: Chứng minh rằng 2^17+2^14 chia hết cho 9

Comments ( 2 )

  1. 2^17 + 2^14 = 2^14 . 2^3 + 2^14 . 1
    = 2^14 . ( 2^3 + 1 ) = 2^14 . 9 vdots 9 ( Điều phải chứng minh )

  2. 2^17 + 2^14
    = 2^14 (2^3 + 1)
    =2^14 ( 8 +1)
    =2^14 .9
    9 chia hết cho 9
    ⇒2^14 .9 chia hết cho 9
    hay 2^17 + 2^14 chia hết cho 9
     

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