Answer
$$643\sqrt{4}=1286$$
Explanation
| $$ \begin{aligned}643\sqrt{4}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}643\cdot2 \xlongequal{ } \\[1 em] & \xlongequal{ }1286\end{aligned} $$ | |
| ① | The square root of $ 4 $ is $ 2 $. |
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