| $$ \begin{aligned}2v\cdot8v^8y^8\cdot2y^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}32v^9y^{12}\end{aligned} $$ | |
| ① | $$ 2 v \cdot 8 v^8 y^8 \cdot 2 y^4 = 32 v^{1 + 8} y^{8 + 4} = 32 v^9 y^{12} $$ |