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设元是七年级学生必须掌握的一种基本技能,也是列方程解应用题的关键步骤之一．恰当地设元,往往能收到事半功倍的神奇效果．设什么元,需要根据具体问题的条件确定．下面通过例题简要说明列方程解应用题中常见的四种设元方法．
Sentence is a basic skill that must be mastered by the seventh grade students, and it is also one of the key steps in solving the problem of solving equations. Properly set yuan, often can receive magical results with twice the effort. What kind of element should be set according to the conditions of the specific problem. The following examples illustrate briefly the common four kinds of setting methods in solving equation problems.