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A={x apartine Z stelat l x^2 ≤ 2^2}
x^2 ≥ 0
dar in problema, x apartine Z stelat ==> x≠0 ==> x > 0 ==> x^2 > 0
0 < x^2 ≤ 2^2
0 < x^2 ≤ 4
0 < x ≤ 2
x apartine multimii = {1;2}