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a)
D = R
b)
x - 1 ≠ 0
x ≠ 1
D = R \ {1}
c)
x + 5 ≥ 0
x ≥ - 5
D: x ∈ <-5; +∞)
d)
2 - x > 0
-x > -2 /:(-1)
x < 2
D: x ∈ (-∞; 2)
11.18
a)
D = R
b)
D = R
c)
x ≠ 0
D = R \ {0}
d)
8 + x ≠ 0
x ≠ - 8
D = R \ {-8}
e)
4x - 3 ≠ 0
4x ≠ 3
x ≠ 3/4
D = R \ {3/4}
f)
3 + x ≥ 0
x ≥ -3
D: x ∈ <-3; +∞)