Odpowiedź:
a)
2 - (x + 3)/3 < (2x - 3)/2 | * 6
2 * 6 - 2(x + 3) < 3(2x - 3)
12 - 2x - 6 < 6x - 9
- 2x + 6 < 6x - 9
- 2x - 6x < - 9 - 6
- 8x < - 15 | * (- 1 )
8x > 15
x > 15/8
x > 1 7/8
x ∈ ( 1 7/8 , + ∞ )
b)
4(x - 3)² - (2x - 5)² ≥ 2
4(x² - 6x + 9) - (4x² - 20x + 25) ≥ 2
4x² - 24x + 36 - 4x² + 20x - 25 ≥ 2
- 4x + 11 ≥ 2
- 4x ≥ 2 - 11
- 4x ≥ - 9 | * (- 1)
4x ≤ 9
x ≤ 9/4
x ≤ 2 1/4
x ∈ (- ∞ , 2 1/4 >
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Odpowiedź:
a)
2 - (x + 3)/3 < (2x - 3)/2 | * 6
2 * 6 - 2(x + 3) < 3(2x - 3)
12 - 2x - 6 < 6x - 9
- 2x + 6 < 6x - 9
- 2x - 6x < - 9 - 6
- 8x < - 15 | * (- 1 )
8x > 15
x > 15/8
x > 1 7/8
x ∈ ( 1 7/8 , + ∞ )
b)
4(x - 3)² - (2x - 5)² ≥ 2
4(x² - 6x + 9) - (4x² - 20x + 25) ≥ 2
4x² - 24x + 36 - 4x² + 20x - 25 ≥ 2
- 4x + 11 ≥ 2
- 4x ≥ 2 - 11
- 4x ≥ - 9 | * (- 1)
4x ≤ 9
x ≤ 9/4
x ≤ 2 1/4
x ∈ (- ∞ , 2 1/4 >