rozwiąż równania :
to co zaznaczone
przykłady : b, c, d
daje naj

Odpowiedź:
zad 4
b)
x/2 = (x + 1)/4
4x = 2(x +1)
4x = 2x+ 2
4x - 2x = 2
2x = 2
x = 2/2 = 1
c)
2(x -1)/3 = (x + 2)/5
5 * 2(x - 1) = 3(x + 2)
10x - 10 =3x + 6
10x -3x =6 + 10
7x = 16
x = 16/7 = 2 2/7
d)
1 - (2x+ 5)/3 = 4 | * 3
3 - (2x +5)= 4 * 3
3 -2x - 5 =12
- 2x -2 = 12
- 2x = 12 + 2 = 14
2x = - 14
x = - 14/2 = - 7