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

Toán Lớp 8: Cm: (15^n -7^n) chia hết cho 15-7

Toán Lớp 8: Cm: (15^n -7^n) chia hết cho 15-7

Comments ( 1 )

  1. Giải đáp:
     Ta có:
    15^n – 7^n = (15 – 7)(15^(n-1) + 15^(n-2) . 7 + ………. + 7^n) \vdots 15 – 7 = 8
     

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

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