Question

Tìm số tự nhiên n, biết

2 mũ n bằng 8

7 mũ n bằng 49

4 mũ n bằng 64

5 mũ n bằng 625

 

Answer 1

\(2^n=8=2^3\Rightarrow n=3\\ 7^n=49=7^2\Rightarrow n=2\\ 4^n=64=4^3\Rightarrow n=3\\ 5^n=625=5^4\Rightarrow n=4\)

Answer 2

\(2^n=8\Rightarrow2^n=2^3\Rightarrow n=3\)

\(7^n=49\Rightarrow7^n=7^2\Rightarrow n=2\)

\(4^n=64\Rightarrow4^n=4^3\Rightarrow n=3\)

\(5^n=625\Rightarrow5^n=5^4\Rightarrow n=4\)

Answer 3

\(2^n=8=2^3\)

=>n=3

\(7^n=49=7^2\)

=>n=2

\(4^n=64=4^3\)

=>n=3

\(5^n=625=5^4\)

=>n=4