| $$ \begin{aligned}\frac{1}{(3\sqrt{12})^2}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{1}{108}\end{aligned} $$ | |
| ① | $$ (3\sqrt{12})^2 =
3^{ 2 } \cdot \sqrt{12} ^ { 2 } =
3^{ 2 } \sqrt{12} ^2 =
3^{ 2 } \lvert 12 \rvert =
108 $$ |