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

Toán Lớp 6: Tìm số tự nhiên x biết : 3 mũ x : 3 mũ 2021 = ( 1 + 2 + 3 … + 100 ) : 50 – 98

Toán Lớp 6: Tìm số tự nhiên x biết : 3 mũ x : 3 mũ 2021 = ( 1 + 2 + 3 … + 100 ) : 50 – 98

Comments ( 2 )

  1. 3^x : 3^2021 = (1 + 2 + 3 + … + 100) : 50 – 98
    3^x : 3^2021 = (100 + 1) . 100 : 2 : 50 – 98
    3^x : 3^2021 = 5050 : 50 – 98
    3^x : 3^2021 = 101 – 98
    3^x : 3^2021 = 3
    3^x = 3 . 3^2021
    3^x = 3^2022
    => x = 2022
    Vậy x = 2022

  2. 3^x : 3^{2021} = (1 + 2 +…+ 100) : 50 – 98
    3^x : 3^2021 = (100 + 1). 100 : 2 : 50 – 98
    3^x : 3^2021 = 5050 : 50 – 98
    3^x : 3^2021 = 3^1
    x = 1 + 2021
    x = 2022

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