| $$ \begin{aligned}25634765625\cdot2^{13}& \xlongequal{ }25634765625\cdot8192 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}210000000000000\end{aligned} $$ | |
| ① | $ 25634765625 \cdot 8192 = 210000000000000 $ |