1：根号2分之根号32-根号8
=√32/√2-√8
=4√2/√2-2√2
=4-2√2
2：（根号2+根号3）X（根号2-根号3）+2根号12
=2-3+4√3
=4√3-1第一个是根号32-根号8/根号2好吧=(√32-√8)/√2=(4√2-2√2)/√2=2√2/√2=2