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b) x²-9≠ 0
x²≠9
x≠3 i x≠-3
x ∈ R\{-3,3}
c) x-1≠0 x>=0
x≠1
x ∈ [0, +nieskończoność) \{1}
d) x-1≠0
x≠1
x∈ R\{1}
e) x+3≠0
x≠-3
x∈ R\{-3}
f) x²+x+1≠0
Δ = 1-4=-3 brak
x∈R