Odpowiedź:
a)
3(2 - 3x) = x - 4
6 - 9x = x - 4
- 9x - x = - 4 - 6
- 10x = - 10
10x = 10
x = 10/10 = 1
b)
5x - 7 = 0 * (x + 11) - 2(1 - 3x)
5x - 7 = - 2 + 6x
5x - 6x = - 2 + 7
- x = 5
x = - 5
c)
2(x - 1) + x = x - 3(2- 3x)
2x - 2 + x = x - 6 + 9x
3x - 2 = 8x - 6
3x - 8x = - 6 + 2
- 5x = - 4
5x = 4
x = 4/5
d)
2x + 15 ≥ 6x + 7
2x - 6x ≥ 7 - 15
- 4x ≥ - 8
4x ≤ 8
x ≤ 8/4
x ≤ 2
x ∈ (- ∞ , 2 >
e)
5x+ 2 < 7x + 6
5x - 7x < 6 - 2
- 2x < 4
2x > - 4
x > - 4/2
x > - 2
x ∈ ( - 2 , + ∞ )
f)
x + 1 ≥ 2x + 3
x - 2x ≥ 3 - 1
- x ≥ 2
x ≤ - 2
x ∈ (- ∞ , - 2 >
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Odpowiedź:
a)
3(2 - 3x) = x - 4
6 - 9x = x - 4
- 9x - x = - 4 - 6
- 10x = - 10
10x = 10
x = 10/10 = 1
b)
5x - 7 = 0 * (x + 11) - 2(1 - 3x)
5x - 7 = - 2 + 6x
5x - 6x = - 2 + 7
- x = 5
x = - 5
c)
2(x - 1) + x = x - 3(2- 3x)
2x - 2 + x = x - 6 + 9x
3x - 2 = 8x - 6
3x - 8x = - 6 + 2
- 5x = - 4
5x = 4
x = 4/5
d)
2x + 15 ≥ 6x + 7
2x - 6x ≥ 7 - 15
- 4x ≥ - 8
4x ≤ 8
x ≤ 8/4
x ≤ 2
x ∈ (- ∞ , 2 >
e)
5x+ 2 < 7x + 6
5x - 7x < 6 - 2
- 2x < 4
2x > - 4
x > - 4/2
x > - 2
x ∈ ( - 2 , + ∞ )
f)
x + 1 ≥ 2x + 3
x - 2x ≥ 3 - 1
- x ≥ 2
x ≤ - 2
x ∈ (- ∞ , - 2 >
Odpowiedź: