| $$ \begin{aligned}\sqrt{192}\cdot2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}16\sqrt{3}\end{aligned} $$ | |
| ① | $$ 2 \sqrt{192} =
2 \sqrt{ 8 ^2 \cdot 3 } =
2 \sqrt{ 8 ^2 } \, \sqrt{ 3 } =
2 \cdot 8 \sqrt{ 3 } =
16 \sqrt{ 3 } $$ |