f(x)=x/(x-2)(x+1)+√(x-4)
Wyznaczymy Df :
x-2≠0 ∧ x+1≠0 ∧ x-4 ≥ 0
( x≠2 ∧ x≠-1 ∧ x≥ 4 ) ⇔ x ≥ 4 ⇔ x∈<4,∞)
Df=<4,∞)
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f(x)=x/(x-2)(x+1)+√(x-4)
Wyznaczymy Df :
x-2≠0 ∧ x+1≠0 ∧ x-4 ≥ 0
( x≠2 ∧ x≠-1 ∧ x≥ 4 ) ⇔ x ≥ 4 ⇔ x∈<4,∞)
Df=<4,∞)