很多老师都会认为,“实数”一章的教学相比其他知识来讲非常困难.不论老师怎样进行详细的解释,还是有学生一头雾水,一概不通.这一章的学习也成了学生的一道分水岭.怎样让每个学生都接受无理数这一概念呢?还要从本章的起始,也是初中学生见到的第一个无理数“2~(1/2)”的教学谈起.人教版“七年级数学下册”教材对于2~(1/2)的引入是这样安排的.1.探究:能否用两个 Many teachers think that teaching in the chapter “Real Numbers” is very difficult compared to other knowledge. No matter how the teacher explained it in detail, there are still some students who have no idea what to do. How to make every student accept the concept of irrational number? Also from the beginning of this chapter, but also the junior high school students to see the first irrational number “2 ~ (1/2)” teaching talk PEP. “Grade seven mathematics” under the textbook for the introduction of 2 ~ (1/2) is so arranged .1. Exploration: Whether or not to use two