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1.过抛物线上某点的切线与抛物线对称轴的交点和该点在时称轴上的垂足关于抛物线顶,点对称. 证明如图1,一个物体以初速度v。从O点水平抛出,以抛出点O为坐标原点建立饭)即N点为OK的中点.在Rt△尸MQ中,()N是中位线,则口尸一〔月. 2.椭圆上某点与椭圆两焦点连线所夹角的角平分线,?
1. The point where the tangent of a certain point on the parabola line intersects the axis of symmetry of the parabola and the foot of the point on the shaft is symmetric about the top of the parabola. Prove that in Figure 1, an object has an initial velocity v. Throws from point O horizontally, and throws point O as the origin of the coordinate to create a meal). That is, the midpoint where N point is OK. In Rt 尸 corpse MQ, ()N is the median line, then mortuary one [months. 2]. What is the angle bisector of the angle between the point on the ellipse and the two focal points of the ellipse?