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在解题过程中,常常把某个数学表达式 看作一个整体,用一个字母来代替,从而简化 解题过程,这种方法就是换元法． 换元法是重要的数学方法,在数学上有 着十分广泛的应用．下面举例说明换元法在解 题中的具体应用．
In the process of solving a problem, a mathematical expression is often regarded as a whole and replaced by a single letter, so as to simplify the problem solving process. This method is the substitution method. The substitution method is an important mathematical method and has a very wide range of applications in mathematics. The following example illustrates the specific application of the substitution method in the solution.