a)
mianownik ma byc różny od 0
x+1≠0
x≠-1
D: x∈R\{-1}
b)
i znów mianownik ma być różny od 0
x²-9≠0
(x-3)(x+3)≠0
x₁≠3
x₂≠-3
d: x∈R\{-3;3}
x+2≠0
x=-2
c)
x≠-2
x+3≠0
x≠-3
D: x∈R\{-2,-3}
d)
x²-6x≠0
x(x-6)≠0
x₁≠0
x₂≠6
x-4≠0
x≠4
x₃≠4
D: x∈R\{0,4,6}
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a)
mianownik ma byc różny od 0
x+1≠0
x≠-1
D: x∈R\{-1}
b)
i znów mianownik ma być różny od 0
x²-9≠0
(x-3)(x+3)≠0
x₁≠3
x₂≠-3
d: x∈R\{-3;3}
x+2≠0
x=-2
c)
x+2≠0
x≠-2
x+3≠0
x≠-3
D: x∈R\{-2,-3}
d)
x²-6x≠0
x(x-6)≠0
x₁≠0
x₂≠6
x-4≠0
x≠4
x₃≠4
D: x∈R\{0,4,6}