Răspuns:
A reunit B ={1,2,3,4,5}
A intersectat B={3,4,5}
1 € (A-B) => 1 apartine doar multimii A
2 € (B-A) => 2 apartine doar multimii B
=> A={1,3,4,5}
B={2,3,4,5}
