Question
Answer
$$21\sqrt{9}=63$$
Explanation
| $$ \begin{aligned}21\sqrt{9}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}21\cdot3 \xlongequal{ } \\[1 em] & \xlongequal{ }63\end{aligned} $$ | |
| ① | The square root of $ 9 $ is $ 3 $. |
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