有些较难的几何题,可以从结论想起,探索使之成立的条件;当你遇到障碍或陷入绝境时,不妨再从条件推起,慢慢靠拢倒想时所具备的条件,若倒想、正推对起头来,证题的门径就找到了.当你找到了证明的门径后,心里会有三伏天吃冰冻西瓜那样“爽”的感觉.下面以2001年全国初中数学竞赛一道试题为例,说明之.希望同学们从中得到启发、顿悟,因而提高自己的证题能力. Some of the more difficult geometric questions can be conceived from the conclusions and explore the conditions for their establishment; when you encounter obstacles or are in desperation, you may wish to start from the conditions again, and move closer to the conditions you had when you think about them. After you have found the door of the certificate, when you find the door of the proof, there will be a feeling of “coolness” in the frozen fruit of the dog on the day of the dog. Here’s an example of the 2001 junior high school math competition. , Explaining. Hope that the students get inspired, epiphany, and thus improve their ability to testify.