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Katrinzeta2004
a fost răspuns

A={12,17,45,72,98,123,345,666,958,1342,5643,39504,720102}
Enumerati elementele multimilor :
B={x|x ∈ in A si 3|x}
C={x|x ∈ in A si 3 nu se divide x }

Răspuns :

A={12,17,45,72,98,123,345,666,958,1342,5643,39504,720102}
B={x I x∈A si 3 I x}
B={12,45,72,123,345,666,5643,39504,720102}
C={x I x∈A si 3 nu se divide cu x}
C={17,98,958,1342}