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5(a-3)mai miv sau egal 9+ a



Răspuns :

5(a-3)≤9+a
5a-15≤9+a

4a≤24, a≤6
5(a-3)≥9+a⇒5a-15≥9+a⇒5a-a≥15+9⇒4a≥24⇒a≥24/2⇒a≥6
succes