Vaa rogg e urgenttttttttttttttttttt

Răspuns:
Explicație pas cu pas:
a)
α ∩ β = BC
b)
i) D ∉ α
ii) A ∈ (d,g)
iii) AD ⊄ α
iiii) AD ⊂ (e,f)
c) (d,e) ∩ (f,g) = BC