Question

Вычислите задание это

Answer 1

$frac{3}{sqrt{(2-sqrt5)^2}}-3sqrt5-1=frac{3}{|2-sqrt5|}-3sqrt5-1=frac{3}{sqrt5-2}-3sqrt5-1=\\=frac{3-(3sqrt5+1)(sqrt5-2)}{sqrt5-2}=frac{3-15+2+6sqrt5-sqrt5}{sqrt5-2}=frac{-10+5sqrt5}{sqrt5-2}=\\=frac{5(sqrt5-2)}{sqrt5-2}=5$