Question

Giúp mk với ạ!

15\(^x\):5\(^x\)=81

Answer 1

Ta có:15^x:5^x=81

<=> 3^x.5^x:5^x=81

<=> 3^x=81=3⁴

<=> x=4

Answer 2

15^x:5^x=81

3^.5^x:5^x=81

3^x=81

3^4=81

Answer 3

\(\Leftrightarrow\)\(15^{x}:5^{x}=3^{4}\)

\(\Leftrightarrow\)\(x=4\)