反证法是一种间接论证的方法。初中几何第二册正式向学生介绍了此方法。由于反证法的思维方式与直接证法的思维过程不尽相同，初中学生掌握起来有一定的困难。对此，笔者认为，可以采取提前渗透的办法来加以解决。也就是说，在初一、初 Counter-evidence is an indirect method of argumentation. The second volume of junior high school geometry officially introduced this method to students. Because the way of thinking of the counter-evidence method is not the same as that of the direct evidence method, junior high school students have certain difficulties in mastering it. In this regard, the author believes that it can be resolved by adopting an early infiltration approach. In other words, at the beginning of the first year