Answer
$$6\sqrt{3}\cdot3\sqrt{6}=54\sqrt{2}$$
Explanation
| $$ \begin{aligned}6\sqrt{3}\cdot3\sqrt{6}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}54\sqrt{2}\end{aligned} $$ | |
| ① | $$ 18 \sqrt{18} =
18 \sqrt{ 3 ^2 \cdot 2 } =
18 \sqrt{ 3 ^2 } \, \sqrt{ 2 } =
18 \cdot 3 \sqrt{ 2 } =
54 \sqrt{ 2 } $$ |
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