| $$ \begin{aligned}(3x^4y^4)^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9x^8y^8\end{aligned} $$ | |
| ① | $$ \left( 3x^4y^4 \right)^2 = 3^2 \left( x^4 \right)^2 \left( y^4 \right)^2 = 9x^8y^8 $$ |