一、通过操作 ,构建平均数概念１ 同学们在生活中可以变废为宝 ,如把易拉罐稍作加工做成笔筒 ,请把笔筒放在桌上 ,把你们的铅笔放在里面。师 :看着你的笔筒和铅笔 ,你能提出什么问题。生 :我想使我们组每个笔筒的铅笔同样多？师 :下面我们就以小组为单位来研究怎样才能使每个笔 First, through the operation, the concept of building an average 1 students can turn waste into treasure in life, such as the cans slightly processed into a pen holder, put the pen holder on the table, put your pencil inside. Teacher: Looking at your pen and pencil, what questions can you ask? Student: I want to make as many pencils for each pen in our group? Teacher: Now let's take a group as a unit to study how to make every pen