Question

[trantuanhuy]

tìm n

9 < 3n <27

25 < 5ⁿ < 3125

Answer 1

[nghia]

\(9< 3n< 27\)

\(3.3< 3n< 3.9\)

\(\Rightarrow3< n< 9\)

\(\Rightarrow n=\left\{4;5;6;7;8\right\}\)

\(25< 5^n< 3125\)

\(5^2< 5^n< 5^5\)

\(\Rightarrow2< n< 5\)

\(\Rightarrow n=\left\{3;4\right\}\)