Question
Answer
$$3\sqrt{105}\cdot7\sqrt{273}=441\sqrt{65}$$
Explanation
| $$ \begin{aligned}3\sqrt{105}\cdot7\sqrt{273}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}441\sqrt{65}\end{aligned} $$ | |
| ① | $$ 21 \sqrt{28665} =
21 \sqrt{ 21 ^2 \cdot 65 } =
21 \sqrt{ 21 ^2 } \, \sqrt{ 65 } =
21 \cdot 21 \sqrt{ 65 } =
441 \sqrt{ 65 } $$ |
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