数列中有一类问题涉及的量较多,解题时往往因假设的未知量过多而难以顺利解答,事实上可以充分挖掘数列有关项的数量关系、分析已知条件的特征,运用“减元”,借助于定义、性质、图像等尽量减少未知量的个数,促使较复杂的问题转化较简单的问题,从而简化解题步骤,优化解题过程. One type of problem in a sequence of numbers involves a large number of problems. When the problem is solved, it is often difficult to solve the problem because of too many unknown quantities. In fact, the quantity relationship of the related items can be fully tapped, and the characteristics of known conditions can be analyzed. “To reduce the number of unknowns by means of definitions, properties, images, etc., to facilitate the transformation of more complex problems into simpler ones, thereby simplifying the problem solving process and optimizing the problem solving process.”