Question
Answer
$$9\cdot8\sqrt{90}=216\sqrt{10}$$
Explanation
| $$ \begin{aligned}9\cdot8\sqrt{90}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}216\sqrt{10}\end{aligned} $$ | |
| ① | $$ 72 \sqrt{90} =
72 \sqrt{ 3 ^2 \cdot 10 } =
72 \sqrt{ 3 ^2 } \, \sqrt{ 10 } =
72 \cdot 3 \sqrt{ 10 } =
216 \sqrt{ 10 } $$ |
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