| $$ \begin{aligned}8-\sqrt{144}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8-12 \xlongequal{ } \\[1 em] & \xlongequal{ }-4\end{aligned} $$ | |
| ① | $$ - \sqrt{144} = -1 \cdot 12 = -12 $$ |