初中阶段证明线段相等的方法非常多,下面我们以一道题为例来说明常见的几种证明线段相等的方法.题目如图1,在△ABC中,AB=AC,D为AB上一点,F是AC延长线上一点,且BD=CF,连接DF交BC于点E,求证:DE=EF.证明一、利用全等三角形证明方法一如图2,作DM∥AC,交BC于M. Junior high school to prove that there are many equivalent line segments, the following we take an example as an example to illustrate several common methods to prove that the line segments equal to the problem in Figure 1 ABC, AB = AC, D AB point, F Is the extension of the AC line a little bit, and BD = CF, connect DF to pay BC at point E, verify: DE = EF. Prove the use of congruent triangulation method shown in Figure 2, as DM∥AC, pay BC in M.