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Determinati multimea A { x ∈ Z | 2x + 1 | ≤ 3 }.

Răspuns :

-3≤2x+1≤3  | -1
-4≤2x≤2  |:2
-2≤x≤1
x∈ [-2,1]⇒ A={-2,-1,0,1}