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determinati elementele multimi b={y apartine n 9<x< 18



Răspuns :

B={x apartine N | 9<x<18}

deci 10<=x<=17 si x nr natural, adica:

B={10, 11, 12, 13, 14, 15, 16, 17}
B={10,11,12,13,14,15,16,17}
cred ca enuntul e putin gresit, ce cauta y