| $$ \begin{aligned}(2x^3y^7)^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}16x^{12}y^{28}\end{aligned} $$ | |
| ① | $$ \left( 2x^3y^7 \right)^4 = 2^4 \left( x^3 \right)^4 \left( y^7 \right)^4 = 16x^{12}y^{28} $$ |