va rog am nevoie de ele pâna la ora 11!!
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3. A∪B = 0,1,2,3,4,5,6; B∪A = 0,1,2,3,4,5,6; A∩B = 2; (A∪B)∪C = 0,1,2,3,4,5,6,7,8,9; A∪(B∪C) = 0,1,2,3,4,5,6,7,8,9; B∩A = 2; A-B = 1,3,5; B-A = 0,4,6; (A-B)-C = 3; A- (B-C) = 1,3,5.
4. a) A = a,b; B = b,c
b) A = a,b,c; B = a,b,c
c) A = a,b,c; B = d,e,f