Question

giúp mình với ạ

Answer 1

\(3^{x-2}=66+15=81\)

\(3^{x-2}=3^4\)

\(\Rightarrow x-2=4\Rightarrow x=6\)

Answer 2

\(c,PT\Rightarrow3^{x-2}=81\Rightarrow3^{x-2}=3^4\Rightarrow x-2=4\Rightarrow x=6\)

Vậy: \(x=6\)

Answer 3

\(3^{x-2}-15=66\\ \Leftrightarrow3^{x-2}=66+15=81\\ Mà:81=3^4\\ \Rightarrow3^{x-2}=3^4\\ \Rightarrow x-2=4\\ \Leftrightarrow x=6\)

Answer 4

\(\Leftrightarrow3^{x-2}=66+15=81\\ \Leftrightarrow3^{x-2}=3^4\\ \Leftrightarrow x-2=4\\ \Leftrightarrow x=6\)