Question

Упростите
$frac{1}{ sqrt{5}+ sqrt{2} } + frac{1}{ sqrt{5}- sqrt{2} }$

Answer 1

$frac{1}{ sqrt{5}+ sqrt{2} } + frac{1}{ sqrt{5}- sqrt{2} } = frac{sqrt{5}- sqrt{2}}{( sqrt{5}- sqrt{2})(sqrt{5}+ sqrt{2})} + frac{sqrt{5}+ sqrt{2}}{( sqrt{5}- sqrt{2})(sqrt{5}+ sqrt{2}) } = frac{2sqrt{5}}{3}$

Answer 2

спасибо