本文主要谈线段相等关系的证明.本文将线段相等关系的问题分成了两类,在第一类问题中主要介绍两种基本方法(全等三角形法和等角对等边法),而在第二类问题(证明三条线段间的相等关系)中,着重介绍如何将第二类问题转化为第一类问题,主要介绍三种方法(直接转化、截长和补短).一、证明两条线段相等且这两条线段前面的系数均为1. This paper mainly talks about the proof of the equal relation of line segments.This paper divides the problems of the equal relation of line segments into two types, in which the two basic methods (congruent triangulation method and equilateral angle equivalence method) are mainly introduced, while in the In the second type of problem, which proves the equal relationship between the three lines, we mainly introduce how to transform the second type of problem into the first type of problem, mainly introducing three methods (direct conversion, cut-off and shortening) The line segments are equal and the coefficients in front of the two line segments are both 1.