1. Wyznacz zbiory: AUB, AnB, A | B, B \ A.
a) A= (-3;0), B = (-1; 4)
b) A = (-4; 2), B = (-1/2; 3)
c) A = (-°°;2), B = (0; 2)
d) A = (-1;2), B = (2; °°)