Răspunsuri

2014-04-30T22:07:11+03:00
2014-04-30T22:43:11+03:00
|x-3|+51=4|x-3|
3|x-3|=51
|x-3|=17
x-3=17,  sau      x-3=-17
x1=20                  x2=-14

|x1+x2|=6