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

Toán Lớp 6: A=2^2+2^4+2^6+-…+2^2020 hay so sanh 3A voi 2^202

Toán Lớp 6: A=2^2+2^4+2^6+…….+2^2020 hay so sanh 3A voi 2^202

Comments ( 1 )

  1. Lời giải chi tiết:
    Ta có:
    A=2^2+2^4+2^6+…+2^2020
    2^2xxA=2^4+2^6+2^8+…+2^2022
    2^2xxA-A=(2^4+2^6+2^8+…+2^2022)-(2^2+2^4+2^6+…+2^2020)
    3A=2^2022-2^2
    Lại có:
    2^2022-2^2<2^2022
    Vậy 3A<2^2022
                                                  
    @uniquetimehunter
                                                  

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

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