(-无穷,-2)U(3,无穷);【4,+无穷)
A-2<=x<4B8-2x>=3x-73x+2x<=8+7x<=3AUB={x| -2<=x<坦并薯=3}Cu(AUB)={x|x<-2 U x>让者3}CuA={x|x<-2 U x>=4}CuB={x|x>3}CuA∩CuB={x|x>蔽大=4}