| $$ \begin{aligned}2 \cdot \frac{\sqrt{23}}{23}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{2\sqrt{23}}{23}\end{aligned} $$ | |
| ① | $$ \color{blue}{ 2 } \cdot \sqrt{23} = 2 \sqrt{23} $$$$ \color{blue}{ 1 } \cdot 23 = 23 $$ |