Răspuns:
A={1,2,3,4}
y=x²-1
y=1²-1=1-1=0
y=2²-1=4-1=3
y=3²-1=9-1=8
y=4²-1=16-1=15
B={0,3,8,15}
z=6-x
z=6-1=5
z=6-2=4
z=6-3=3
z=6-4=2
C={2,3,4,5}
a) (AnB)U(BnC)={3}U{3}={3}
b) (A-C)n(C-B)={1}n{2,4,5}=0
c) (AUC)-(BnA)={1,2,3,4,5}-{3}={1,2,4,5}
d) (B-C)U(A-B)={0,8,15}U{1,2,4}={0,1,2,4,8,15}
