trong ki thi violympic toam tren internet danh cho hoc sinh tieu hoc cua huyen yen phong nam hoc 2010 2011 binh minh viet nam dat tong cong 960 diem tinh so diem moi ban dat duoc biet rang so diem cua minh gap 2 lan so diem cua binh gap 1/2 so diem cua nam neu minh co them 30 diem nua thi bang so diem cua viet