在学生的思维发展区内,对“题源”进行由易到难、循序渐进的变式训练,让学生经历问题变式的探索过程,丰富“变题”策略,感受探究乐趣,体验变与不变的辩证关系,引导学生养成“变式思考”问题的习惯,促进学生认知结构的优化和探索能力的提升. In the area of ​​thinking development of students, the students should undergo the process of exploration from “easy to difficult” step-by-step to make the students experience the process of problem variation, enrich the strategy of “changing problems”, feel the pleasure of exploring, Experience the changing and invariable dialectical relationship and guide students to develop the habit of “variant thinking”, and promote the optimization of students’ cognitive structure and the exploration of their abilities.