众所周知 ,三角形的重心有许多重要的性质并有其广泛的应用 ,最近笔者发现有许多地方把它用于求最短距离之和 ,如 :《数学大世界》2 0 0 2年第 4期第 2 3页上刊登了题为“斯泰纳最短距离问题”的文章 (由吉林梅河口电视大学关德华、刘卓韬撰写 ) ,刘凯年主编、武汉大学出版社出 As we all know, the triangle’s center of gravity has many important properties and has its wide range of applications. Recently, the author found that there are many places to use it for the sum of the shortest distance, such as: “Mathematical World,” the fourth period of the second year of 2002. An article titled “The shortest distance problem of Steiner” (written by Guan Dehua and Liu Zhuoxue of Jilin Meihekou TV University) was published on page 3, edited by Liu Kainian and published by Wuhan University Press.