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

Toán Lớp 7: thực hiện phép tính 9 mũ 2 . 3 mũ 3 / 3 mũ 7 . 2020

Toán Lớp 7: thực hiện phép tính
9 mũ 2 . 3 mũ 3 / 3 mũ 7 . 2020

Comments ( 2 )

  1. $\textit{#TamCongTu}$
    $9^2.\dfrac{3^3}{3^7}.2020$
    $=9^2.(\dfrac{1}{3^4}).2020$
    $=81.(\dfrac{1}{3^4}).2020$
    $=81.(\dfrac{1}{81}).2020$
    $={2020}$
     

  2. $\dfrac{9^2.3^3}{3^7.2020}$
    = $\dfrac{(3^{2})^{2}.3^3}{3^7.2020}$
    = $\dfrac{3^4.3^3}{3^7.2020}$
    = $\dfrac{3^7}{3^7.2020}$
    =1/2020

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