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B...............................•----------------o
A...........•------------------•
-------------|------------------|----------------|--------
.............-4.................2................9
AvB=<-4,9)
A^B=2
A\B=<-4,2)
B\A=(2,9)
b)
B..............•---------------------•
A--------------•.....o-----o
----------------|-----|-----|---------|-------------------
................0.....1.....2.........4
AvB=(-∞,4>
A^B={0}^(1,2)
A\B=(-∞,0)
B\A=(0,1)v<2,4>
kropeczki ominac ;p