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 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。
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