极限求解中的变与换  

Change and Replacement in Limit for Solving

作　　者：杜莹[1] 薛艳霞[1] 

机构地区：[1]沈阳理工大学应用技术学院,抚顺113122

出　　处：《价值工程》2012年第7期205-205,共1页Value Engineering

摘　　要：极限的运算是极限理论的重要组成部分。掌握极限的求解方法,特别是未定型极限的求解方法是学生学好高等数学的前提。本文结合教学实践,指出"变"与"换"在极限求解中的重要作用。The operation of limit is an important part of the limit theory.Grasping the solutions of limit,especially the solutions of limit of indeterminate form,is the premise of learning higher mathematics for students.In this paper,combining with teaching practice,the important role of ＂change＂ and ＂replacement＂ was pointed out in the limit for solving.

关 键 词：未定型极限 恒等变形 换元 等价无穷小代换 

分 类 号：G642[文化科学—高等教育学]