$$ \begin{aligned}2\sqrt{25}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2\cdot5 \xlongequal{ } \\[1 em] & \xlongequal{ }10\end{aligned} $$ | |
① | The square root of $ 25 $ is $ 5 $. |