| $$ \begin{aligned}yy\cdot2y\cdot2y\cdot3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12y^4\end{aligned} $$ | |
| ① | $$ y y \cdot 2 y \cdot 2 y \cdot 3 = 12 y^{1 + 1 + 1 + 1} = 12 y^4 $$ |