从而给出了以平面上任意点为焦点、任意直线为准线，任意正数为离心率的圆锥曲线的直接作图方法。
Thus, we give a make-graph method of conic section on plane with arbitrary point as foci, arbitrary line as directrices and arbitrary positive number as eccentricity.
利用变换思想，对圆锥曲线教学中的一道例题进行分析，得出了各种圆锥曲线的焦点弦，并引伸其结论，将圆锥曲线的焦点弦变换为中心弦。
By using transformation thought, this paper obtains the focus chord of all kinds of conic section through analyzing a sample in conic section teaching.
应用推荐