| $$ \begin{aligned}4{f^4}^2\frac{f}{8^{f^{10}}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4\cdot1f^8\frac{f}{8^{f^{10}}} \xlongequal{ } \\[1 em] & \xlongequal{ }4f^8\frac{f}{8^{f^{10}}}\end{aligned} $$ | |
| ① | $$ \left( f^4 \right)^2 = 1^2 \left( f^4 \right)^2 = f^8 $$ |