Answer
$$7\cdot\frac{\sqrt{6}}{7}\sqrt{14}=2\sqrt{21}$$
Explanation
| $$ \begin{aligned}7 \cdot \frac{\sqrt{6}}{7}\sqrt{14}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{14\sqrt{21}}{7} \xlongequal{ } \\[1 em] & \xlongequal{ }2\sqrt{21}\end{aligned} $$ | |
| ① | $$ \color{blue}{ 7 \sqrt{6} } \cdot \sqrt{14} = 14 \sqrt{21} $$$$ \color{blue}{ 7 } \cdot 1 = 7 $$ |
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