有些几何习题,虽然图形有别,语言表述不同,但是,条件、结论及其证法都存在着共性。所以,我们在习题教学中,要注意引导学生仔仔细细观察、分析和研究图形,加以去粗取精、去伪存真、由此及彼、由表及里的思索,从变中寻求不变,发掘习题之间的本质联系,揭示证题规律,这种透过现象看本质的教学,对于培养学生分析问题和解决问题的能力、抽象思维和概括归纳的能力,进行辩证唯物主义观点教育,都是大有裨益的。下面,仅就两组习题来说明这个问题。第一组: Some geometric exercises, although the graphics are different and the language is expressed differently, but the conditions, conclusions, and proofs are common. Therefore, we must pay attention to guiding students to carefully observe, analyze, and study the figures in the exercise of the exercises, and apply coarseness to the essence, to falseness to the truth, and to the other, from the reflections of the table and the inside, to seek change from change, and to explore the problems. The essence of the connection, revealing the laws of the subject matter. This kind of teaching through the phenomenon of seeing the essence of the teaching ability of the students in analyzing problems and solving problems, abstract thinking, and summarizing and summarizing the ability to conduct dialectical materialist education is a great benefit. of. In the following, this problem will be explained only for two sets of exercises. First group: