要正确运用定理,必须要让学生知道定理的来龙去脉也就是怎么来的,一般用在哪里?对于证明定理的过程一定要步步清楚,结论明确。二要简单明了,少占时间,用更多的时间与学生一起探讨“用定理”的思路、格式。长此以往,教学质量必定大大提高。首先,必须弄清楚定理的题设和结论两部分。有的比较典型,比如,“如果两条直线都和第三条直线平行,那么这 To correctly use the theorem, we must let the students know the ins and outs of the theorem, that is, where is the general use? For the process of proof of the theorem must be clear step by step, the conclusion is clear. Second, it should be simple and clear, take less time, spend more time with students to discuss the idea of ​​”using theorems“ and the format. In the long run, the quality of teaching will be greatly enhanced. First of all, we must clarify the hypothesis of the theorem and the conclusion of two parts. Some are typical, for example, ”If two straight lines and the third straight line parallel, then this