变式,就是不断变更问题的情境或改变思维的角度,在保持事物本质特征不变的情况下,使事物的非本质属性不断迁移的变化方式.变式是模仿与创新的中介,是掌握知识的重要途径.变式既是一种重要的思想方法,也是一种重要的学习手段.现在,我们来看看八年级课本《等腰三角形》一节中一道习题的变式学习. The variant is the changing situation of the problem or changing the perspective of the thinking, and changing the non-essential property of the thing while maintaining the essential characteristics of the thing. The variant is the intermediary of the imitation and innovation, and is the mastery of knowledge. The important approach. The variant is both an important way of thinking and an important learning tool. Now, let’s take a look at the variants of a problem in the eighth grade textbook Isosceles Triangle.