在小学低年级数学教学中，含有相差关系的应用题，尤其是“反叙”应用题，历来是教学中的难点。在这方面，本人做了一些尝试，摸索出一套采用字面分析来判断谁多谁少的方法，并收到了一定成效。在相差关系应用题中，都有一个含有相差数量关系的条件(或问题)。解题时，可把这一 In the lower grades of primary school mathematics teaching, including the application of the difference between the problem, especially the “anti-narrative” questions, has always been a teaching difficulty. In this regard, I have done some attempts to find out a set of methods for using literal analysis to judge who owes less and who have achieved some success. In the application of the difference between the problems, there is a difference between the number of conditions (or problems). Problem solving, you can put this one