Answer
$$30\cdot\frac{\sqrt{5}}{5}=6\sqrt{5}$$
Explanation
| $$ \begin{aligned}30 \cdot \frac{\sqrt{5}}{5}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{30\sqrt{5}}{5} \xlongequal{ } \\[1 em] & \xlongequal{ }6\sqrt{5}\end{aligned} $$ | |
| ① | $$ \color{blue}{ 30 } \cdot \sqrt{5} = 30 \sqrt{5} $$$$ \color{blue}{ 1 } \cdot 5 = 5 $$ |
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