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

Toán Lớp 6: A = 2 + 2^2 + 2^3 + 2^4 +…+ 2^50

Tháng Sáu 1, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: A = 2 + 2^2 + 2^3 + 2^4 +…+ 2^50

Comments ( 2 )

  1. giangnguyen33
    giangnguyen33
    1 Tháng Sáu, 2022 at 9:52 chiều
    Reply
    A = 2 + 2^2 + 2^3 + 2^4 + … + 2^50
    2A = 2^2 + 2^3 + 2^4 + … + 2^51
    2A – A = (2^2 + 2^3 + 2^4 + … + 2^51) – (2 + 2^2 + 2^3 + 2^4 + … + 2^50)
    A = 2^51 – 2
    Vậy A = 2^51 – 2
     

  2. cobelolen
    cobelolen
    1 Tháng Sáu, 2022 at 9:52 chiều
    Reply
    A = 2 + 2^2 + 2^3 + 2^4 + …. + 2^50
    2A = 2^2 + 2^3 + 2^4 + 2^5 + …. + 2^51
    2A – A = ( 2^2 + 2^3 + 2^4 + 2^5 + …. + 2^51 ) – ( 2 + 2^2 + 2^3 + 2^4 + …. + 2^50 )
    A = 2^51 – 2
    Vậy , A = 2^51 – 2 .

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

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