1.√3+2√5+12√3+2√2
=(√3+12√3)+2√5+2√2
=13√3+2√5+2√2
2.(√7+4√3)+(√7-4√3)
=√7+4√3+√7-4√3
=(√7+√7)+(4√3-4√3)
=2√7