Question

plz... answer, who answers my question I will mark them as brainliest,and I will follow them. ​

Answer 1

$\frac{15}{ \sqrt{10} + \sqrt{20} + \sqrt{40} - \sqrt{5} - \sqrt{80} }$

We can write,

√20 = 2√5

√40 = 2√10

√80 = 4√5

$\frac{15}{ \sqrt{10} + 2 \sqrt{5} + 2 \sqrt{10} - \sqrt{5} -4 \sqrt{5} }$

$\frac{15}{3 \sqrt{10} + 2 \sqrt{5} - 5 \sqrt{5} }$

$\frac{15}{3 \sqrt{10} - 3 \sqrt{5} }$

$\frac{15}{3( \sqrt{10} - \sqrt{5} )}$

$\frac{5}{ \sqrt{10} - \sqrt{5} }$

Putting the given values of √10 and √5 we get,

$\frac{5}{3.162 - 2.236}$

$\frac{5}{0.926} = answer$

Or

5.399

Cheers!