| $$ \begin{aligned}162x\cdot10^8& \xlongequal{ }162x\cdot100000000 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}162x\end{aligned} $$ | |
| ① | $$ 162 x \cdot 100000000 = 16200000000 x $$ |