By using the theory of common focus conic bundle, a kind of advantageous directness arithmetic about conic's focus is obtained, and an example is given.
利用共焦点二次曲线束的理论，得出了二次曲线的焦点的一种十分方便的直接算法，并给出了一个计算实例。
By using transformation thought, this paper obtains the focus chord of all kinds of conic section through analyzing a sample in conic section teaching.
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。
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