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rezolvati in N inecuatia:
4x+3,12> sau egal 31,2


Răspuns :

4x+3.12>sau=31.2
4x>sau=31.2-3.12
4x>sau=28.08
x>sau=28.08 : 4
x>sau=7.02
4x ≥ 31,2 - 3,12
4x≥ 28,08
x≥7,02
dar x ∈ N deci x nu poate fi egal cu 7,02
⇒ x∈{8;9;10....n}   n∈N