运用“化归”思想解一类应用题肖 铿（南昌师范学校）解答小学数学应用题时，常常要运用“化归”思想，把我们本不熟悉的问题巧妙地转化为较熟悉的问题，从而使问题顺利地得以解决。本文拟对一类小学数学竞赛题，运用“化归”思想，将它们化归为求反比、解比例及按比分配?.. Solving a class of application problems with the concept of “returning from home” Xiao Yu (Nanchang Normal School) answers the questions of primary school mathematics, often using the idea of ​​“returning from home” to subtly change the questions we are not familiar with into more familiar issues. So that the problem can be solved smoothly. This paper proposes to apply the idea of ​​“returning to a class” in mathematics competitions of primary schools and to convert them into inverse ratios, proportions and proportions..