| $$ \begin{aligned}(-x^2yz^2)(-x^3y^4z)^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}(-x^2yz^2)-x^9y^{12}z^3 \xlongequal{ } \\[1 em] & \xlongequal{ }x^{11}y^{13}z^5\end{aligned} $$ | |
| ① | $$ \left( -x^3y^4z \right)^3 = (-1)^3 \left( x^3 \right)^3 \left( y^4 \right)^3z^3 = -x^9y^{12}z^3 $$ |