《尚未成功的课例》中首例几何体的体积，有三种解法，其实三种解法都是错误的，但尽管如此，老师和学生在课堂上都动了起来，这就是教学的成功．我们整日泡在课堂里，偶而出来，不乏有这样的议论充入耳鼓，“老师讲的时候我们都明白了，但一做题就不会”．什么原因呢？其... There are three solutions to the volume of the first geometric body in the Unsuccessful Courses. In fact, all three solutions are wrong. However, despite the fact that both teachers and students have moved in the classroom, this is teaching success. We soaked in the classroom all day and occasionally came out. There was no shortage of such arguments that filled the ears. “When the teacher talks, we all understand it, but once we do it, we will not.” What are the reasons? its...