| $$ \begin{aligned}(5\sqrt{3})^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}75\end{aligned} $$ | |
| ① | $$ (5\sqrt{3})^2 =
5^{ 2 } \cdot \sqrt{3} ^ { 2 } =
5^{ 2 } \sqrt{3} ^2 =
5^{ 2 } \lvert 3 \rvert =
75 $$ |