创设情景 ,让学生感受体验数学概念、定理的产生、发展过程 ,这是新课程标准提出的一个要求 .自然引入就是要顺着学生的思维进行设计 ,顺着数学知识的发展进行教学 ,不要人为地强制引导 ,力求合情合理 ,避免学生对数学产生畏难情绪 ,让学生亲近数学 ,使学生对学习数学有良好的 Create scenarios to allow students to experience and experience the mathematical concept, the production and development of the theorems. This is a requirement put forward by the new curriculum standards. Natural introduction is to follow the student’s thinking to design, follow the development of mathematical knowledge, teaching, not artificial Mandatory guidance, strive to be reasonable and reasonable, to avoid student’s fear of mathematics, let students close to mathematics, so that students have a good learning mathematics