| $$ \begin{aligned}3^{\sqrt{135}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3^{3\sqrt{15}}\end{aligned} $$ | |
| ① | $$ \sqrt{135} =
\sqrt{ 3 ^2 \cdot 15 } =
\sqrt{ 3 ^2 } \, \sqrt{ 15 } =
3 \sqrt{ 15 }$$ |