x apartine multimii Z x apartine multimii N x apartine multimii Q x apartine multimii nr din Z care nu se afla in N x apartine multimii nr din Q care nu se afla in Z
x apartine multimii nr intregi x apartine multimii nr naturale x apartine multimii nr rationale x apartine multimii nr negative x apartine multimii nr rationale pozitive x apartine multimii nr rationale negative
