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2007年第三届北方数学奥林匹克邀请赛于7月31日～8月4日在古城西安举行,来自河北、陕西、吉林、辽宁、黑龙江、山西六省34所重点中学的200名高一数学骄子参加了角逐,湖北省襄樊五中也应邀派队参加了比赛.本届邀请赛由西北工业大学附中承办,活动得到了陕西省数学竞赛委员会、陕西省科协和西安铁一中的全力支持和协助.竞赛分两天举行,每天三个小时解答4道题.下面对本次竞赛的试题进
In 2007, the 3rd North Mathematical Olympiad Invitational was held in the ancient city of Xi’an from July 31st to August 4th. 200 high school mathematics students from 34 key middle schools from six provinces of Hebei, Shaanxi, Jilin, Liaoning, Heilongjiang and Shanxi participated in the competition. In the competition, Xiangfan Wuzhong of Hubei Province was also invited to send a team to participate in the competition. The invitational tournament was sponsored by the High School of Northwestern Polytechnical University. The event was supported and supported by the Shaanxi Provincial Mathematics Competition Committee, the Shaanxi Provincial Association for Science and Technology, and Xi’an Tione Yizhong. The competition is held in two days and answers four questions every day for three hours. The following questions for the contest