任何一道复合应用题,都是由若干道简单应用题“组合”而成的。因此,搞清这种“组合”关系,亦即找出数量关系的基本结构——“主干”,再顺“干”攀“枝”,理清数量关系的细节——“枝叶”,那么怎样列式,先算什么,再算什么的问题也就迎刃而解了。现举几例试作说明。例2 一个机械化养鸡场一月份产蛋13600只,二月份产蛋的只数是一月份的2倍,三月份比二月份多产蛋1200只。这个养鸡场第一季度共产蛋多少只?指导学生读题、理解题意,分清条件和问题之后,引导学生从问题入手,纵观全题找出数量关系的“主干”: Any application of a composite question, are made by a number of simple questions “combination” made. Therefore, to find out such a “combination” of relations, that is, to find the basic structure of quantitative relations - the “backbone”, and then “dry” climbing “branches” to clarify the details of the relationship between quantity - “branches and leaves”, then how Column type, what to count first, then what kind of problem will be solved. Here are a few trial instructions. Example 2 A mechanized chicken farm produced 13,600 eggs in January. The number of eggs laid in February was double that in January and the number of extra eggs in February was 1,200. The number of eggs laid in the farm during the first quarter of this year only guides the students to read the questions, understand the questions and clarify the conditions and problems, and then guide the students to start with the questions and look through the questions to find the “backbone” of the quantitative relationship: