Question

Tìm n \(\in N\), biết:

\(3^n.7^2=1323\)

Answer 1

\(3^n.7^2=1323\Leftrightarrow3^n.49=1323\Leftrightarrow3^n=\dfrac{1323}{49}=27\)

\(\Leftrightarrow3^n=3^3\Rightarrow n=3\) vậy \(n=3\)

Answer 2

\(3^n.7^2=1323\)

\(\Rightarrow3^n.49=1323\)

\(\Rightarrow3^n=\dfrac{1323}{49}\)

\(\Rightarrow3^n=27\)

\(\Rightarrow3^n=3^3\Rightarrow n=3\)

Answer 3

\(3^n.7^2=1323\)

\(\Rightarrow3^n.49=1323\)

\(\Rightarrow3^n=27\)

\(\Rightarrow n=3\)