1
(√(3+√5)+√(3-√5)²=3+√5+3-√5+2√[(3+√5)(3-√5)]=6-√(9-5)=6-√4=6-2=4
2
(2a+3b)/a(2a-3b)+(2a-3b)/a(2a+3b)-16a/[(2a-3b)(2a+3b)]=
=[(2a+3b)²+(2a-3b)²-16a*a]/(4a²-9b²)=
=(4a²+12ab+9b²+4a²-12ab+9b²-16a²)/(4a²-9b²)(-8a²+18b²)/(4a²-9b²)=
=-2(4a²-9b²)/(4a²-9b²)=-2