A=[1,3] B = (2,5) C = (-inf, 2)
a) A∩B = (2,3]
AUB=[1,5)
A/B=multime vida
B/A=(3,5)
b) A∩C=[1,2)
AUC=(-inf, 3]
A/C = [2,3]
C/A=(-inf,1)
c) B∩C=multime vida
BUC=(-inf,5)
B/C=(2,5)
C/B=(-inf,2)
