我们知道,平面内到定点F的距离与到定直线l(点F不在l上)的距离的比为常数e的点的轨迹为圆锥曲线,记为Γ,这里定点F为其焦点,定直线l为与F对应的准线,常数e为其离心率.根据离心率e的不同的取值范围,可以将Γ划分 We know that the trajectory of the point where the ratio of the distance from the fixed point F to the distance to the fixed straight line l (point F is not l) is a constant e is a conic curve, denoted by Γ, where the fixed point F is its focal point, l is the alignment corresponding to F, the constant e is its eccentricity.According to different values ​​of the eccentricity e range, Γ can be divided