列方程解应用问题时,比较困难的一环是学生常常不知如何着手去找等量关系。由于应用问题千变万化。等量关系各式各样,什么行程问题,工程问题,浓度问题,……等等,如果每一种问题都来考查一下找等量关系的规律,这不仅太繁杂,而且罗列也不是真正的概括。那么根据什么原则来找出应用问题中的 One of the more difficult problems in solving the application of equations is that students often do not know how to proceed to find equal relationships. Due to the ever-changing application problems. There is a wide range of equal relations, what itinerary problems, engineering problems, concentration issues, etc. If every question is examined to find the law of equal relations, this is not only too complicated, but it is not really listed. Generalize. So according to what principle to find out the application problem