Question
Answer
$$-3\sqrt{5}\cdot4\sqrt{10}=-60\sqrt{2}$$
Explanation
| $$ \begin{aligned}-3\sqrt{5}\cdot4\sqrt{10}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-60\sqrt{2}\end{aligned} $$ | |
| ① | $$ - 12 \sqrt{50} =
-12 \sqrt{ 5 ^2 \cdot 2 } =
-12 \sqrt{ 5 ^2 } \, \sqrt{ 2 } =
-12 \cdot 5 \sqrt{ 2 } =
-60 \sqrt{ 2 } $$ |
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