$$ \begin{aligned}\sqrt{1}^2+3^2& \xlongequal{ }1^2+3^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}1+9 \xlongequal{ } \\[1 em] & \xlongequal{ }10\end{aligned} $$ | |
① | $ 1 ^ 2 = 1 $$ 3 ^ 2 = 9 $ |