Odpowiedź:
5)
I2 - 3xI = 1
2 - 3x = 1 ∨ 2 - 3x = - 1
- 3x = 1 - 2 ∨ - 3x = - 1 - 2
- 3x = - 1 ∨ - 3x = - 3
3x = 1 ∨ 3x = 3
x = 1/3 ∨ x = 1
∨ - znaczy "lub"
6)
I2x + 1I ≤ 5
2x + 1 ≤ 5 ∧ 2x + 1 ≥ - 5
2x ≤ 5 - 1 ∧ 2x ≥ - 5 - 1
2x ≤ 4 ∧ 2x ≥ - 6
x ≤ 4/2 ∧ x ≥ - 6/2
x ≤ 2 ∧ x ≥ - 3
x ∈ < - 3 , 2 >
∧ - znaczy "i"
7)
I2x - 4I > 3
2x - 4 > 3 ∨ 2x - 4 < - 3
2x > 3 + 4 ∨ 2x < - 3 + 4
2x > 7 ∨ 2x < 1
x > 7/2 ∨ x < 1/2
x > 3 1/2 ∨ x < 1/2
x ∈ ( - ∞ , 1/2 ) ∪ ( 3 1/2 , + ∞ )
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Odpowiedź:
5)
I2 - 3xI = 1
2 - 3x = 1 ∨ 2 - 3x = - 1
- 3x = 1 - 2 ∨ - 3x = - 1 - 2
- 3x = - 1 ∨ - 3x = - 3
3x = 1 ∨ 3x = 3
x = 1/3 ∨ x = 1
∨ - znaczy "lub"
6)
I2x + 1I ≤ 5
2x + 1 ≤ 5 ∧ 2x + 1 ≥ - 5
2x ≤ 5 - 1 ∧ 2x ≥ - 5 - 1
2x ≤ 4 ∧ 2x ≥ - 6
x ≤ 4/2 ∧ x ≥ - 6/2
x ≤ 2 ∧ x ≥ - 3
x ∈ < - 3 , 2 >
∧ - znaczy "i"
7)
I2x - 4I > 3
2x - 4 > 3 ∨ 2x - 4 < - 3
2x > 3 + 4 ∨ 2x < - 3 + 4
2x > 7 ∨ 2x < 1
x > 7/2 ∨ x < 1/2
x > 3 1/2 ∨ x < 1/2
x ∈ ( - ∞ , 1/2 ) ∪ ( 3 1/2 , + ∞ )