用方程解应用题和用算术方法解应用题是两种截然不同的思路。要学好用方程解应用题，关键是先要把问题和条件联系起来思考，看它们之间存在什么样的数量关系，再确定等量关系，然后列出程式，最后求出方程的解。 用方程解应用题一般有两种解法。这是因为任何三者数量之 Using equations to solve problems and using arithmetic to solve problems is two completely different ideas. To learn how to solve problems using equations, the key is to think about the problems and conditions first, see what kind of quantitative relationships exist between them, and then determine the equivalent relations, and then list the equations and finally find the solutions to the equations. There are two general solutions to the problem using equations. This is because of the number of any three