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在解题过程中,有时需要根据实际情况引进新的变量以化简原有的复杂式子,使问题的本质能清晰地显现出来,也便于求解,这种解题方法,我们称之为换元法.换元法的理论依据是等价代换,它是借用一种语言符号来表达同一个问题.换元法的本质是转化,通过换元,将问题化归为我们比较熟悉的形式,它体现了思维的灵活性和创造性.换元法的一般步骤为:设元、换元、求解、回代和检验等.需要注意的是,在换元时应该确定好新变
In the problem-solving process, sometimes need to introduce new variables according to the actual situation to simplify the original complex formula, so that the nature of the problem can be clearly demonstrated, and easy to solve, this problem-solving method, which we call the change Meta-method.The theory of Meta-method is equivalence substitution, which borrows a linguistic symbol to express the same problem.The essence of the substitution method is transformation, by changing the yuan, the problem is classified as our familiar form , Which embodies the flexibility and creativity of thinking.Transformation method for the general steps are: set yuan, Yuan Yuan, solution, back to the generation and testing, etc. It should be noted that, in the replacement should be identified when a new change