Question

Решите пожалуйста!!!!!!!

Answer 1

$1) (2sqrt{5}-7)^2+28sqrt{5}=69-28sqrt{5}+28sqrt{5}=69\ 2) frac{7-3sqrt{2}}{7+3sqrt{2}}+frac{7+3sqrt{2}}{7-3sqrt{2}}=frac{(7-3sqrt{2})^2+(7+3sqrt{2})^2}{(7-3sqrt{2})(7+3sqrt{2})}=frac{49+42sqrt{2}+18+49-42sqrt{2}+18}{49-18}=frac{98+36}{31}=frac{134}{31}$