| $$ \begin{aligned}2v^2u^5\cdot3v\cdot7u^7& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}42u^{12}v^3\end{aligned} $$ | |
| ① | $$ 2 v^2 u^5 \cdot 3 v \cdot 7 u^7 = 42 u^{5 + 7} v^{2 + 1} = 42 u^{12} v^3 $$ |