Odpowiedź :
Zadanie 10
a)
2(x + 4) + 6x = 8
2x + 8 + 6x = 8
2x + 6x = 8 - 8
8x = 0 | : 8
x = 0
b)
5x - 2(x + 4) = 10
5x - 2x - 8 = 10
5x - 2x = 10 + 8
3x = 18 | : 3
x = 6
c)
-4 + 4(2 - 5x) = -9
-4 + 8 - 20x = -9
-20x = -9 + 4 - 8
-20x = -13 | : (-20)
x = 13/20
Przykład a)
2 (x + 4) + 6x = 8
2x + 8 + 6x = 8
2x + 6x = 8 - 8
8x = 0
x = 0
Przykład b)
5x - 2 (x + 4) = 10
5x - 2x - 8 = 10
5x - 2x = 10 + 8
3x = 18 |: 3
x = 6
Przykład c)
-4 + 4 (2 - 5x) = -9
-4 + 8 - 20x = -9
- 20x = -9 + 4 - 8
- 20x = -13 |: (-20)
x = 13/20