$$ \begin{aligned}\sqrt{12}\cdot\sqrt{8}\sqrt{98}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}56\sqrt{3}\end{aligned} $$ | |
① | $$ \sqrt{9408} =
\sqrt{ 56 ^2 \cdot 3 } =
\sqrt{ 56 ^2 } \, \sqrt{ 3 } =
56 \sqrt{ 3 }$$ |