| $$ \begin{aligned}3(2a^3)^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3\cdot16a^{12} \xlongequal{ } \\[1 em] & \xlongequal{ }48a^{12}\end{aligned} $$ | |
| ① | $$ \left( 2a^3 \right)^4 = 2^4 \left( a^3 \right)^4 = 16a^{12} $$ |