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A={n|n apartineN,n=3^a+2^b ,a apartine{1,2},b apartune={0,1,2,3}B={m|m apartine N,m=2*n-5,n apartineA} C{p|p apartineN,p=5^2+n-17,mapartineB} scrieti multimile prin enumerare,AinteesectiaB,A reuniuneaB reuniuneaC,B-C