《数学教师》1995·2期刊登了陈金寿老师的《单尺作图及证明两例》一文,陈老师在该文中介绍了仅用直尺可将线段AB二等分、三等分,并给予了证明,读罢颇受启发。 命题 已知线段AB平行直线L,仅用单尺可将线段AB二等分. 这是原文中的例1,本文先就这个命题给出另外 In the “Physician Teacher” 1995·2 issue, a book entitled “One-Foot Drawing and Proof Two Cases” by Mr. Chen Jinshou, Teacher Chen introduced in this article that only the ruler can divide the line segment AB into two equal parts and three equal parts, and give Proof, read and inspired. Proposition Known line segment AB is parallel to line L. Line segment AB can be divided into two parts by a single rule. This is case 1 in the original text. This article first gives an alternative for this proposition.