Question

Решите................

Answer 1

$5(3+2 sqrt{2} )=15+10 sqrt{2} \ (3 sqrt{5} + sqrt{15})^2-10 sqrt{27} = \ =(3 sqrt{5})^2+2cdot3 sqrt{5}cdot sqrt{15}+( sqrt{15}) ^2-10 sqrt{27} = \ =45+6sqrt{75}+15-10 sqrt{27} =60+30sqrt{3}-30 sqrt{3} =60$