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

Toán Lớp 6: Tính : A = 1 + 2 + 2 ² + … + 2^100 = ??

Toán Lớp 6: Tính : A = 1 + 2 + 2 ² + … + 2^100 = ??

Comments ( 2 )

  1. A = 1 + 2 + 2^2 + … + 2^100
    2A = 2 + 2^2 + 2^3 + … + 2^101
    2A – A = ( 2 + 2^2 + 2^3 + … + 2^101 ) – ( 1 + 2+ 2^2 + … + 2^100 )
    => A = 2^101 – 1

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