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

Toán Lớp 6: CMR : 2 mũ 70 + 3 mũ 70 chia hết cho 13

Toán Lớp 6: CMR : 2 mũ 70 + 3 mũ 70 chia hết cho 13

Comments ( 2 )

  1. 2^70 + 3^70
    = (2^2)^35 + (3^2)^35
    = 4^35 + 9^35 \vdots 4 + 9
    → 4^35 + 9^35 \vdots 13
    → 2^70 + 3^70 \vdots 13
     

  2. 2⁷⁰ + 3⁷⁰ = (2²)³⁵ + (3²)³⁵  
                   = 4³⁵ + 9³⁵
    Ta có: 4³⁵ + 9³⁵ \vdots 4 + 9
              4³⁵ + 9³⁵ \vdots 13
    Hay 2⁷⁰ + 3⁷⁰ \vdots 13

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