Odpowiedź:
zad1
b)
1/2x + 3 =2
1/2x = 2 - 3 = - 1
x = - 1 : 1/2 = - 1 * 2 = - 2
c)
2x + 5 = - 9
2x = - 9 - 5 = - 14
x = - 14/2 = - 7
d)
3 - 2x = 17
- 2x = 17 - 3
- 2x = 14
2x = - 14
x = - 14/2 = - 7
e)
(x + 1) : 3 = - 2 | * 3
x + 1 = - 2 * 3 = - 6
x = - 6 - 1 = - 7
f)
(x + 4) : 2 = 2 |* 2
x + 4 = 2 * 2 = 4
x = 4 - 4 = 0