线段的中点是几何图形中的一个特殊的点,它关联着三角形的中线、直角三角形斜边上的中线、中心对称图形、三角形中位线、梯形中位线等丰富的知识,又能与图形变换等重要的几何方法有机地融为一体,因此,近年来以中点为背景的试题在各省中考试卷及各级各类数学竞赛中屡屡现身,现采撷几例作分类解析. The midpoint of the line segment is a special point in the geometry associated with the midline of the triangle, the midline on the hypotenuse of the right triangle, the centrosymmetric graphic, the median line in the triangle, the median line in the trapezoid, Therefore, in recent years the midpoint of the test questions in the examination papers at all levels and various levels of mathematics competitions often appear, is the pick several cases for classification analysis.