| $$ \begin{aligned}3ab(-2ab^2)^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3ab-8a^3b^6 \xlongequal{ } \\[1 em] & \xlongequal{ }-24a^4b^7\end{aligned} $$ | |
| ① | $$ \left( -2ab^2 \right)^3 = (-2)^3a^3 \left( b^2 \right)^3 = -8a^3b^6 $$ |