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Se considera multimea A={x∈Z|-2≤3x+1≤8} , Determinati A∩N.

Răspuns :

-2≤ 3x+1 ≤ 8 | -1 
-3
≤ 3x ≤ 7 | :3
-1
≤ x ≤ 7/3 

A={-1,0,1,2}    
A∩N={0,1,2}