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

Toán Lớp 6: Chứng minh A=1+2+2^2+…+2^119 chia hết cho 7

Toán Lớp 6: Chứng minh A=1+2+2^2+…+2^119 chia hết cho 7

Comments ( 2 )

  1. $ A = ( 1+2+2^2)+…+(2^{117}+2^{118}+2^{119} ) $ 
    $ A = 7 + … + 2^{117}(1+2+2^2)=7+..+2^{117}.7=(1+..+2^{117}).7 ⇒ đpcm $

  2. Giải đáp:
     @hoidap247
    #starboyvndz
    xin CTLHN
     

    toan-lop-6-chung-minh-a-1-2-2-2-2-119-chia-het-cho-7

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

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