Question
Answer
$$3\sqrt{15}\cdot4\sqrt{20}=120\sqrt{3}$$
Explanation
| $$ \begin{aligned}3\sqrt{15}\cdot4\sqrt{20}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}120\sqrt{3}\end{aligned} $$ | |
| ① | $$ 12 \sqrt{300} =
12 \sqrt{ 10 ^2 \cdot 3 } =
12 \sqrt{ 10 ^2 } \, \sqrt{ 3 } =
12 \cdot 10 \sqrt{ 3 } =
120 \sqrt{ 3 } $$ |
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