通过列综合算式解答应用题，可以更好地弄清题里的已知量和未知量之间的联系，发展学生的概括能力。正确灵活地列综合算式，有以下几种方法。追根代入法。就是从最后一个分步算式出发，追根究底，逐步代入。例１：蔬菜村运来一批化肥，用大车运了３０００千克，用卡车运的... Through column synthesis formula to answer questions, you can better understand the problem of the known amount and the unknown link between the development of students' ability to summarize. The correct and flexible column comprehensive formula, there are several ways. Substitution into the law. That is, starting from the last step-by-step formula, to follow suit and gradually replace it. Example 1: Vegetable Village shipped a batch of fertilizer, with a large car shipped 3000 kg, shipped by truck ...