A:x²-x-6<0(x-3)(x+2)<0-2B:x²+2x-8>0(x+4)(x-2)>0x<-4或x>2C:x²-4ax+3<0x=[4a±√(16a²-12)]/22a-√(4a²-3) A∩B=-4∵A∩B∈C,∴C最少为-44a²-3≥0 →a≥√3/2或a≤-√3/22a-√(4a²-3)<-4 →a<-19/162a+√(4a²-3)>3 →a>1∴a的取值范围为a(-∞,-√3/2]∪[√3/2,+∞)