圆锥曲线的一个性质

A Nature of the Cone Curve

通过一道高三试题的研究,给出了抛物线的一个性质,进而推广到椭圆和双曲线,从而得到了圆锥曲线的一个性质·

Through the research of an examination question of Senior Three,I can provide a nature of the parabola,and then popularize to oval and hyperbola,thus get a nature of the cone curve.