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

Toán Lớp 7: Giupws mình với : 1/9 . 27 ^ n <3 ^n

Toán Lớp 7: Giupws mình với :
1/9 . 27 ^ n <3 ^n

Comments ( 1 )

  1. $\frac{1}{9}$ . $27^{n}$ < $3^{n}$
    $\frac{27^n}{9}$ < $3^{n}$ 
    $\frac{3^{3n}}{3^2}$ < $3^{n}$
    $3^{3n-2}$ < $3^{n}$
          ⇒ 3n – 2 < n 
          ⇒ 3n – n < 2
          ⇒ 2n < 2
          ⇒ n < 1 
    mà n ∈ N ⇒ n ∈ ( 0;1 )
     

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