教学“商不变性质”,一般的教法是,先让学生填出表中每组除法的商: 然后通过教师的提问引导,让学生从比较中概括出商不变性质。具体过程大体是:从左往右看,以第1组为标准,先将第2组与第1组比较,被除数有什么变化?除数有什么变化?商呢?再将第3-5组依次与第1组比较,回答上述问题。进而让学生概括出“被除数和 Teaching “business invariance”, the general method is to first let the students fill out the division of the table for each business: and then through the teacher's question guide, let students from the comparison to summarize the business invariant nature. The specific process is generally: from left to right to see the first group as a standard, the first group of 2 compared with the first group, what is the change of the divisor? Divisor What changes? Compared with the first group, answer the above questions. Then let the students summed up the "dividend and