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

Toán Lớp 7: cho căn bậc 2 x bằng 3 khi đó x mũ 2 bằng ?

Toán Lớp 7: cho căn bậc 2 x bằng 3 khi đó x mũ 2 bằng ?

Comments ( 2 )

  1. $\text{$\sqrt{x}$=3}$
    $\text{($\sqrt{x}$)²=3²}$
    $\text{x=3²}$
    $\text{x=9}$
    $\text{⇒x²=81}$
     

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