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解析几何中有很多定值问题,笔者最近从一道有关圆的初中平面几何题出发,通过猜想、类比、推理,发现了有心二次曲线的一个定值.
There are many fixed value problems in analytic geometry. Recently, I started from a plane geometry problem about the middle school of junior high school. Through conjecture, analogy and reasoning, I found a definite value of concentric conics.