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应用换元法分解因式，不但能将问题化繁为简、化难为易，而且能拓宽思路、提高解题的技能技巧现以近年来部分省市的数学竞赛题为例，归类介绍几种富有技巧性的换元法，供同学们参考一、常数换无例1分解困式：x4＋1997x2＋1996x＋1997（1996年第七届“希望杯”初二培训题）分析
The use of the substitution method to factorize the factors can not only simplify the problem and simplify the process, but also can broaden the train of thought and improve the skill of solving problems. Now the math contest topics in some provinces and cities in recent years are taken as examples. Kind of skillful substitution method for students to refer to. 1. Constant constant replacement No. 1 decomposition of sleepy type: x4+1997x2+1996x+1997 (The seventh “Hope Cup” second grade training title in 1996)