Explicație pas cu pas:
[tex] \bf a) \: \: - 1 \in (0, 1) \implies \red{ Fals}[/tex]
[tex]\bf b) \: \: 2 \in (1, 3) \implies \green{Adevarat }[/tex]
[tex]\bf c) \: \: - 5 \in ( - 5, 4) \implies \red{Fals}[/tex]
[tex]\bf d) \: \:- 1 \in ( -\infty , 2) \implies \green{Adevarat}[/tex]