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

Toán Lớp 6: A= 2 + 2^2 + 2^3 + -+2^2021

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

Comments ( 2 )

  1. A=2+2^2+2^3+…+2^2021
    2A=2^2+2^3+2^4+…+2^2022
    2A-A=(2^2+2^3+2^4+…+2^2022)-(2+2^2+2^3+…+2^2021)
    A=2^2022 -2
    Vậy A=2^2022 -2

  2. ~ Bạn tham khảo ~
    A = 2+2^2+2^3+….+2^2021
    2A = 2^2+2^3+2^4+……+2^2022
    2A – A = (2^2+2^3+2^4+…..+2^2022) – (2+2^2+2^3+….+2^2021)
    A = 2^2022 – 2
    Vậy A = 2^2022 – 2
    $#Vịt vàng$

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

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