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

Toán Lớp 6: cho a = 2 + 2^2 + 2^3 + 2^4 + … + 2^100 chia hết cho 3

Toán Lớp 6: cho a = 2 + 2^2 + 2^3 + 2^4 + … + 2^100 chia hết cho 3

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    A = 2 + 2^2 + 2^3 + 2^4 + … + 2^100
    => A = (2 + 2^2) + (2^3 + 2^4) + …. + (2^99 + 2^100)
    => A = 2(1+2) + 2^3(1+2) + … + 2^99(1+2)
    => A = 3(2+2^3+…+2^99)\vdots3 (Đpcm)

  2. A = 2 + 2^2 + 2^3 + …… + 2^100
    A = (2 + 2^2) + (2^3 + 2^4) + ….. + (2^99 + 2^100)
    A = 2(1 + 2) + 2^3(1 + 2) + ……. + 2^99(1 + 2)
    A = 2 . 3 + 2^3 . 3 + ……. + 2^99 . 3
    A =(2 + 2^3 + ….. + 2^99) . 3 \vdots 3 (Do 3 \vdots 3)
    Vậy A \vdots 3

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

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