在立体几何的教学中,立几问题常常利用“化归”的思想方法,转化为平几问题来解决,而类比平几中的结论,来演绎出立几中类似的结论,则是反其道而行之,这对学生的归纳和推理能力以及逆向思维能力都提出了较高的要求,因而得到了命题者的青睐,近几年的高考试题中又开始频繁出现,正是由于以上的原因,我们在平时应当注意这一方面的能力训练,以 In the teaching of three-dimensional geometry, several problems are often solved by the method of thinking of “turning back into ” and transformed into just a few problems. However, the analogy of a few conclusions leads to the conclusion that a similar conclusion is established In the opposite direction, which imposes higher requirements on the students’ inductive and inferential ability as well as the ability of reverse thinking, and thus has been favored by the proponents. In recent years, college entrance examination exams have begun to appear frequently, precisely because of For the above reasons, we should usually pay attention to this aspect of capacity training