Author(s): XIE Qihong
Pages: 34-35+41
Year: 1993 Issue:  6
Journal: High-School Mathematics
Keyword:  数学奥林匹克; 非负整数解; 教师进修学校; 平行四边形; 中学; 不同余; 重合; 直线; 原方程; 均值不等式;