老师常常会告诫同学们:不能盲目做题!这就需要分析题意,在做几何证明题时,往往可以有多种证题途径,最有效的一条途径往往是条件结论一起考虑,我们首先考虑条件能向结论提供什么有效信息,而后考虑结论需要条件提供什么有效信息.这也就是通常说的“两头凑”的分析方法.例1如图1, The teacher often tells the students that they can’t do blindly! This requires analysis of the meaning of the questions. When doing geometrical proofs, there are often many ways to test questions. The most effective way is often to consider the conditional conclusions. We first consider Conditions can provide any valid information to the conclusions, and then consider what effective conditions the conclusions need to provide. This is what is commonly called the “two ends” analysis method. Example 1 is shown in Figure 1.