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a
2(x + 5) = 2x + 10
2x + 10 = 2x + 10 równanie tożsamościowe
b
2(x - 3) + 3(4 - x) = 5
2x - 6 + 12 - 3x = 5
- x = 5 + 6 - 12 = - 1
x = 1
zad1
- 3(x + 1) ≥ 3
- 3x - 3 ≥ 3
- 3x ≥ 3 + 3
-3x ≥ 6
3x ≤ - 6
x ≤ - 6/3
x ≤ - 2
x ∈ (- ∞ , - 2>
zad 2
a + 1 + a + 2 + 3a + 3 = 26
4a + 6 = 26
4a = 26 - 6 = 20
a = 20/4 = 5
zad 3
odp b
zad 7
2/5 x + 1 = x - 2 / * 5
2x + 5 = 5x - 10
za x wstawiamy 5
2 * 5 + 5 = 5 * 5 - 10
10 + 5 = 25 - 10
15 = 15
L = P
prawdziwe
zad 8
x - 2 < 3
x < 3 + 2
x < 5
np 6
zad 9
3x + 1 < 5
3x < 5 - 1
3x < 4
x < 4/3
x < 1 1/3
te liczby to - 2 , - 1/2 , 0