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a)
2x - 3 ≠ 0
2x ≠ 3 /:2
x ≠ 1,5
D = R \ {1,5}
b)
3x - 9 ≥ 0
3x ≥ 9 /:3
x ≥ 3
D: x ∈ <3; +∞)
c)
(x - 4)(x + 2) ≠ 0
x ≠ 4
x ≠ -2
D = R \ {-2; 4}
d)
3 - x ≥ 0
-x ≥ -3 /:(-3)
x ≤ 3
4x - 8 > 0
4x > 8 /:4
x > 2
D: x ∈ (2; 3>
2.
a)
x² + 4 > 0, dla każdego "x"
D = R
x + 1 = 0
x = -1
b)
x ≥ 0 i 2 - x > 0
x ≥ 0
i
-x > -2 /:(-1
x < 2
D: x ∈ <0; 2)
√x = 0
x = 0
c)
x² - 4 ≠ 0
(x + 2)(x - 2) ≠ 0
x ≠ -2
x ≠ 2
D = R \ {-2;2}
x - 2 = 0
x = 2 ∉ D, brak miejsc zerowych