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23 nu apartine Z \ N va rog explicati mi ce inseamna chestia asta Z \ N

Răspuns :

Z-Multimea numerelor intregi:
Z={...-n,-1,-n.....-2,-1,0,1,2,.....n,,n+1...}  Ex=-1,0,2,+3 etc.

N-Multimea numerelor naturale:
N={0,1,2......,n,n+1...}
N*={1,2,...n,n+1....}    Ex: 0,3,5,9 etc