平几证明题的一题多证可引导学生从不同的角度去思考,证题,是培养学生多向思维,提高推理论证能力的一种极好做法,因而在教学上经常采用.但一题多证的教学应有明确的教学目的.1 以指导学生如何添设辅助线为目的添设辅助线是平几证题的关键,因为辅助线是已知与求证间的桥梁,辅助线添得是否合理,会直接影响 The multiple proofs of a few proofs can guide students to think and test from different perspectives, which is an excellent practice for cultivating students’ multi-dimension thinking and improving the ability to infer theoretical evidence. Therefore, they are often used in teaching. The teaching of multi-licences should have a clear teaching purpose.1 The addition of auxiliary lines to guide students on how to add auxiliary lines is the key to a few certificates, because the auxiliary line is a bridge between known and certified, and the auxiliary line adds Whether it is reasonable will have a direct impact