Toán Lớp 7: 927 ≤ $3^{n}$ ≤243
$2^{16}$ ≥ $2^{n}$> 4
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Toán Lớp 7: 927 ≤ $3^{n}$ ≤243
$2^{16}$ ≥ $2^{n}$> 4
giúppppp
Comments ( 1 )
9)\\
27 \le {3^n} \le 243\\
\Leftrightarrow {3^3} \le {3^n} \le {3^5}\\
\Leftrightarrow 3 \le n \le 5\\
\Leftrightarrow n \in \left\{ {3;4;5} \right\}\\
Vậy\,n \in \left\{ {3;4;5} \right\}\\
10)\\
{2^{16}} \ge {2^n} > 4\\
\Leftrightarrow {2^{16}} \ge {2^n} > {2^2}\\
\Leftrightarrow 16 \ge n > 2\\
\Leftrightarrow 2 < n \le 16\\
\Leftrightarrow n \in \left\{ {3;4;5;…;15;16} \right\}\\
Vậy\,n \in \left\{ {3;4;5;…;15;16} \right\}
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