Question

Pls answer this question

Answer 1

$\frac{30}{ \sqrt{20} + \sqrt{5} } = \frac{30}{ \sqrt{5 \times 4} + \sqrt{5} }$
$= \frac{30}{2 \sqrt{5} + \sqrt{5} } \\ = > \frac{30}{ 3 \sqrt{5} }$
$= = > \frac{10}{ \sqrt{5} }$
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