二次曲线的平行弦中点轨迹方程它的一般求法趋于公式化,无逻辑推理,求法单调,有的求解过程还较为复杂,而高中解析几何中的几类特殊二次曲线,求它的弦中点轨迹方程时,一般又是要引用韦达定理及中点坐标公式等,使得求解过程较为复杂,现介绍此类问题的另一求法供参考. The general method of the quadratic curve of the chord midpoint trajectory equation tends to be formulated without logic reasoning, seeking monotonous, some of the solution process is more complicated, and high school analytical geometry of several types of special conic, find its string Mid-point trajectory equation, the general is to quote the Veda's theorem and the mid-point coordinate formula, making the solution process is more complex, is to introduce another method for such problems for reference.