Answer
$$2\sqrt{6}\cdot5\sqrt{10}=20\sqrt{15}$$
Explanation
| $$ \begin{aligned}2\sqrt{6}\cdot5\sqrt{10}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}20\sqrt{15}\end{aligned} $$ | |
| ① | $$ 10 \sqrt{60} =
10 \sqrt{ 2 ^2 \cdot 15 } =
10 \sqrt{ 2 ^2 } \, \sqrt{ 15 } =
10 \cdot 2 \sqrt{ 15 } =
20 \sqrt{ 15 } $$ |
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