| $$ \begin{aligned}\sqrt{90.25}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3\sqrt{10}\end{aligned} $$ | |
| ① | $$ \sqrt{90} =
\sqrt{ 3 ^2 \cdot 10 } =
\sqrt{ 3 ^2 } \, \sqrt{ 10 } =
3 \sqrt{ 10 }$$ |