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

Toán Lớp 6: A=1+3+3^2+3^3+–…+3^2021 gấp

Toán Lớp 6: A=1+3+3^2+3^3+………..+3^2021
gấp

Comments ( 2 )

  1. A = 1+3+3^2+3^3+………..+3^2021
    3A = 3+3^2+3^3+………..+3^2022
    3A – A = 3^2022 – 1
    2A = 3^2022 – 1
    A = (3^2022 – 1) : 2
    A = (3^2022 – 1)/2

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

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