例题的层次安排,在数学教学中,在一定程度上影响着教学效果,特别是想要达到有机串联的境界的话,主要呈现形式是变式,对某种基本知识技能、典型问题、思维模式等,在保持其本质特征不变的情况下,使非本质属性发生变化,或变更问题的情境,或改变问题的条件,或改变问题的结论,或改变思维的角度、方式,这样的变化过程叫变式。一般做法是从一个题出发,通过变化条件、结论等得到新的题, The arrangement of the examples in mathematics teaching affects the teaching effect to a certain extent. Especially if you want to reach the realm of organic concatenation, the main presenting forms are the variations, the basic knowledge and skills, the typical problems, the thinking patterns, etc. , Change the non-essential attribute or change the situation of the problem, change the condition of the problem, change the conclusion of the problem or change the angle and the way of thinking under the condition of keeping its essential characteristics unchanged Variants. The general approach is to start from a question, through the changing conditions, conclusions and other new questions,