| $$ \begin{aligned}sqrt\frac{x^2\cdot2x}{(2x)^3\cdot3^{2x}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}sqrt\frac{x^2\cdot2x}{8x^3\cdot3^{2x}}\end{aligned} $$ | |
| ① | $$ \left( 2x \right)^3 = 2^3x^3 = 8x^3 $$ |