Question

3^x .3^2x = 3⁵ .9²

Answer 1

Giải:

\(3^x.3^{2x}=3^5.9^2\)

\(\Leftrightarrow3^{x+2x}=3^5.3^4\)

\(\Leftrightarrow3^{3x}=3^9\)

\(\Leftrightarrow3x=9\)

\(\Leftrightarrow x=3\)

Vậy ...

Answer 2

* Trả lời:

\(3^x.3^{2x}=3^5.9^2\)

\(\Rightarrow3^x.3^{2x}=3^5.\left(3^2\right)^2\)

\(\Rightarrow3^x.3^{2x}=3^9\)

\(\Rightarrow3^{3x}=3^9\)

\(\Rightarrow3^x=3^3\)

\(\Rightarrow x=3\)