| $$ \begin{aligned}4\sqrt{1296}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4\cdot36 \xlongequal{ } \\[1 em] & \xlongequal{ }144\end{aligned} $$ | |
| ① | The square root of $ 1296 $ is $ 36 $. |