Question

Answer 1

\(a,2^n=2^3\\ n=3\\ b,3^n=3^3\\ n=3\\ c,5^n=5^4\\ n=4\\ d,n^3=5^3\\ n=5\\ e,3^{2n}=3^4\\ 2n=4\\ n=2\\ g,7^3:7^n=7^2\\ 7^n=7\\ n=1\)

Answer 2

Bài 3 

\(2^n=8\)

\(2^n=2^3\)

`=>n=3`

b) \(3^n=27\)

\(3^n=3^3\)

`=>n=3`

\(5^n=625\)

\(5^n=5^4\)

`=>n=4`

\(n^3=125\)

\(n^3=5^3\)

`=>n=5`

\(3^n\cdot3^2=81\)

\(3^n\cdot3^2=3^4\)

\(3^n=3^2\)

`=>n=2`

\(343:7n=49\)

\(7n=\dfrac{343}{49}\)

\(7n=7\)

`=>n=7/7=1`