Răspunsuri

2014-10-28T22:02:43+02:00
Daca y = 13
x + 2 * 13 = 17
x = 17 - 26
x = - 9
13 - 3z = 4
- 3z = 4 - 13
- 3z = - 9
z = 9 : 3
z = 3
ce crezi?