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在关于x的一元二次方程中,有时为了解题的方便.需把x视为“常量”,而选择其中的一个变量为“主元”,这种考虑问题的方法称为主元法.下面举例说明主元法在讨论方程根的情况中的独特作用.
In the quadratic equation about x, it is sometimes convenient to understand the problem. You need to treat x as a “constant” and choose one of the variables as a “principal element”. This method of considering the problem is called the principal element method. The following is an example of the unique role of the principal component method in the discussion of the equation root.