Question

1/9 . 3^4 . 3^n = 3^7

Giúp mk tìm n nhé! Lời giải đc ko? Cần gấp lắm!

Answer 1

\(\frac{1}{9}\cdot3^4\cdot3^n=3^7\)

\(\frac{1}{9}\cdot3^n=3^7:3^4\)

\(\frac{1}{9}\cdot3^n=3^3\)

\(\frac{1}{9}\cdot3^n=27\)

\(3^n=27:\frac{1}{9}\)

\(3^n=243\)

\(3^n=3^5\)

=> \(n=5\)

Answer 2

\(\frac{1}{9}.3^4.3^n=3^7\\ \frac{1}{9}.81.3^n=3^7\\ 9.3^n=3^7\\ 3^2.3^n=3^7\\ 3^{n+2}=3^7\\ n+2=7\\ n=5\)

Answer 3

1/9*3^4*3^n=3^7

9*3^n=2187

3^n=2187:9

3^n=243

3^n=3^5