Trong 1 ki thi, tong so diem 6 mon thi cua 4 hoc sinh nhu sau: diem cua nguoi thu nhat bang 12/51 tong so diem 3 nguoi con lai, diem cua nguoi thu hai bang 17/48 tong so diem 3 nguoi con lai, diem cua nguoi thu 3 bang 19/46 tong so diem 3 nguoi con lai,nguoi thu tu duoc 45 diem. hoi moi nguoi duoc bao nhieu diem