1.(2√3-√2)(√3+2√2)
=6-√6+4√6-4
=2+3√6

2.(-1-√5/2)^2
=1+√5+5/4
=9/4+√5

3.a√16a+3√a^3-1/2a^2√4/a(a>0)
=4a√a+3a√a-a√a
=6a√a