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一、问题的提出圆与椭圆是两类重要的二次曲线,椭圆的好多重要性质都可以类比圆来研究.例如,在圆中有一个重要的性质:AB为圆C的任意一条直
First, the question raised Round and oval are two types of important conic, many important properties of the ellipse can be analogy to study. For example, there is an important property in the circle: AB is a straight line C straight