二元二次方程组求解的基本思想是“转化” ,转化的方法是“降次”、“消元” ,即通过降次或者消元 ,将方程组转化为一元二次方程或二元一次方程组来解 .由于这类方程组的题型较多 ,解题方法灵活多样 ,所以 ,在解这类方程组时 ,要先认真分析方程组中各个方程的结构特征 ,选择较 The basic idea of ​​the solution of the binary quadratic equations is “transformation”. The transformation method is “decrease times” and “eliminations”. That is, by reducing the number of times or eliminating the elements, the system of equations can be converted into a quadratic equation or a binary system. The system of equations solves the problem. Because there are many questions in this type of equations, the problem-solving methods are flexible and diverse. Therefore, when solving this type of equations, we must first carefully analyze the structural characteristics of each equation in the equations, and choose