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根据具体条件和解题需要,从不同的角度出发,在众多变元中选用一个变元为主元,并以此为线索把握解决问题的方法叫做主元法.许
According to the specific conditions and problem solving needs, from a different point of view, one variable is selected as the main element in many variables, and the method to solve the problem is called the main element method.