| $$ \begin{aligned}vxvxxvxv& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}v^4x^4\end{aligned} $$ | |
| ① | $$ v x v x x v x v = v^{1 + 1 + 1 + 1} x^{1 + 1 + 1 + 1} = v^4 x^4 $$ |