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determinati x apartine nr naturale astefel incat :
a) x <2
b) -x c) x d) 2 < sau = x


Răspuns :

a) x<2 => x = {0,1}
b) -x≤3=> x={3,4,5,6,7,8,9....-∞]
c) x≤0 => x={0,-1,-2,-3,-4,-5,-6,-7,,,-∞}
d) 2 ≤ x=>x={2,3,4,5......+∞]