| $$ \begin{aligned}7 \cdot \frac{\sqrt{6}}{6}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{7\sqrt{6}}{6}\end{aligned} $$ | |
| ① | $$ \color{blue}{ 7 } \cdot \sqrt{6} = 7 \sqrt{6} $$$$ \color{blue}{ 1 } \cdot 6 = 6 $$ |