Răspuns :
1) 352-80=272baieti.
272+250=522elevi au rămas
2) (352-80)+250=522
272+250=522
272+250=522elevi au rămas
2) (352-80)+250=522
272+250=522
1. 352+250=602
602-80=522
R=522 elevi
2.(352+250)-80=522
R=522 elevi
602-80=522
R=522 elevi
2.(352+250)-80=522
R=522 elevi