| $$ \begin{aligned}\frac{(2xy)^4}{x^{12}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{16x^4y^4}{x^{12}}\end{aligned} $$ | |
| ① | $$ \left( 2xy \right)^4 = 2^4x^4y^4 = 16x^4y^4 $$ |