| $$ \begin{aligned}4^2\cdot3^5& \xlongequal{ }16\cdot243 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3888\end{aligned} $$ | |
| ① | $ 16 \cdot 243 = 3888 $ |