Question
Answer
$$2\cdot\dfrac{\sqrt{20}}{4\sqrt{5}}=1$$
Explanation
| $$ \begin{aligned}2 \cdot \frac{\sqrt{20}}{4\sqrt{5}}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2\cdot\frac{10}{20} \xlongequal{ } \\[1 em] & \xlongequal{ }1\end{aligned} $$ | |
| ① | Multiply in a numerator. $$ \color{blue}{ \sqrt{20} } \cdot \sqrt{5} = 10 $$ Simplify denominator. $$ \color{blue}{ 4 \sqrt{5} } \cdot \sqrt{5} = 20 $$ |
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