Question

Tìm n biết 27^n : 3^n = 81

Answer 1

27ⁿ : 3ⁿ = 81

(27 : 3)ⁿ = 81

9ⁿ = 81 = 9²

=> n = 2

Answer 2

\(27^n:3^n=81\) 

\(\Rightarrow\left(27:3\right)^n=81\)

\(\Rightarrow9^n=81=9^2\)

\(\Rightarrow n=2\)

Answer 3

Ta có:

27ⁿ:3ⁿ=81

=>27ⁿ:3ⁿ=3⁴

=>Ta chọn n=2

=> 27²:3²=729:9

=81

=>n=2