g. x < 0 dar x∈R <=> x∈(-∞,0) .
h. x+1 > 1 <=> x > 0 dar x∈R <=> x∈(0,∞) .
i. x²-1 > 1 <=> x² > 0 dar x∈R <=> x∈(0,∞) .
j. 3-x > 0 <=> x < 3 si x > 1 <=> 1 < x < 3 dar x∈R => x∈(1,3) .
