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

Toán Lớp 8: CHứng minh rằng 199³ – 199 chia hết cho 200

Toán Lớp 8: CHứng minh rằng 199³ – 199 chia hết cho 200

Comments ( 2 )

  1. 199³-199
    =199(199²-1)
    =199(199+1)(199-1)
    =199xx200xx198
    Vì 199xx200xx198 \vdots 200
    Nên 199^3-199 \vdots 200
     

  2. 199³ – 199
    =199(199²-1)
    =199(199-1)(199+1)
    =199.198.200
    ->199.198.200 chia hết cho 200
    ->199³ – 199 chia hết cho 200
     

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