Question

scrie o inecuatie ce are solutie orice nr natural

Answer 1

x+1<x+2
sau
x+3<2x+7
sau x+5>0

Answer 2

x+5 < x+6 => x-x< 6-5 => x·(1-1) < 1 => x·0 < 1 => 0·x < 1 (A),  ∀ x ∈ ℝ =>
=> x ∈ ℝ (avand toate solutiile reale, are si toate solutiile naturale in acelasi timp, deoarece multimea numerelor naturale apartine multimii numerelor reale N ⊂ R)