Răspunsuri

2014-05-19T15:20:39+03:00
2014-05-19T15:21:18+03:00
P abc=AB+AB+BC=78 (am pus de doua ori AB pt ca AB=AC)
2AB+28=78
2AB=78-28
2AB=50
AB=50:2
AB=25=> AC=25
3 2 3