√2 1 3√5—2√3

原式=√2/(12√10)-√2/√10
=(1/12-1)*√2/√10
=-11/(12√5)
=-11√5/60
原式=(3√5-2√3)²/(3√5-2√3)(3√5+2√3)
=(45-12√15+12)/(45-12)
=(57-12√15)/33
=(19-4√15)/11