近年来的中考试题中,围绕二元二次方程组这一考点,出现了许多新题型,反映了二元二次方程组考查的变化趋势.主要的类型有以下几种. 一、探索型例1 一个二元一次方程和一个二元二次方程组成的二元二次方程组的解是x=2,y=4,和x=-2,y=-4.试写出符合要求的方程____.(只要 In the mid-term examination questions in recent years, many new questions have appeared around this test site of the binary quadratic equations, reflecting the trend of changes in the binary quadratic equations. The main types are as follows. Example 1 The solution of a binary quadratic equation consisting of a binary bivariate equation and a binary quadratic equation is x=2, y=4, and x=-2, y=-4. Test written to meet the requirements Equation ____.(As long as