Question
Answer
$$\dfrac{10}{7}\sqrt{20}=\dfrac{20}{7}\sqrt{5}$$
Explanation
| $$ \begin{aligned}\frac{10}{7}\sqrt{20}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{20}{7}\sqrt{5}\end{aligned} $$ | |
| ① | $$ \frac{ 10 }{ 7 } \sqrt{ 20 } =
\frac{ 10 }{ 7 } \sqrt{ 2 ^2 \cdot 5 } =
\frac{ 10 }{ 7 } \sqrt{ 2 ^2 } \, \sqrt{ 5 } =
\frac{ 10 }{ 7 } \cdot 2 \sqrt{ 5 } =
\frac{ 20 }{ 7 } \sqrt{ 5 } $$ |
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