在数学归纳法教学实践中,往往有一部分学生对于诸如“为什么两步缺一不可”、“为什么基础验证有时是一个(如验证n=1)而有时要两个(如验证n=1,再验证n=2),甚至多个”这些事关推理原理的问题缺乏理解,对于比较复杂的数学归纳手段(诸如“滚雪球”式、“交叉式”、“翘翘板式”等等),听课时击节赞叹,感到玄 In the practice of mathematical induction teaching, there are often some students for such as “Why two can not ”, “why the basic verification is sometimes one (such as verification n = 1) and sometimes two (such as verification n = 1, and then verify n = 2), or even more ”These issues related to the lack of understanding of the principle of reasoning, for more complex mathematical induction (such as snowball, cross, Rocker type "and so on), when the lecture was stunned, feel mysterious