配方法可以改变代数式的原有结构,是初中数学中求解变形的一种常用手段,也是挖掘隐含条件的有力工具.配方法在代数式的化简求值、解方程、解最值问题、讨论不等关系等方面有广泛的应用.现就初中数学中常见的几种类型进行归类说明,以供参考:一、在确定二次根式中字母的取值范围中的应用在求二次根式中的字母的取值范围时,可以经过配方,观察被开方数,然后利用被开方数必须大于等于零求得所需要的解. The method can change the original structure of the algebraic formula, which is a common method to solve the deformation in junior high school mathematics and also a powerful tool to excavate the implicit conditions. With the method of algebraic simplification, solving equations, solving the most value problems, discussion Unequal relations, etc. There are several common types of junior high school mathematics are classified description for reference: First, determine the quadratic root in the value of the range of applications in the second root In the letter of the range of values, you can go through the formula, observe the number of square root, and then use the square root must be greater than or equal to zero to obtain the required solution.