从点的集合(或轨迹)的观点来看,圆锥曲线(除圆外)都是与定点和定直线距离的比是常数e的点的集合(或轨迹).这个定点称为焦点,定直线称为他们的准线,由于常数e的取值范围不同,曲线分为椭圆、双曲线和抛物线.深刻理解这一定义(以下简称“统一性”定义),对解决有关圆锥曲线问题有着 From the point of view of the collection (or trajectory) point of view, the conic section (except the circle) is a set (or trajectory) of points where the ratio of the distance between the fixed point and the fixed straight line is a constant e. This fixed point is called the focus, and the straight line They are called their guidelines. Because the range of constant e is different, the curve is divided into ellipses, hyperbolas and parabolas. To deeply understand this definition (hereinafter referred to as the definition of “unity”), it has to solve the problem of conic curves.