Using the plane analytic geometry method,this paper discussed the nature of the central quadratic curves of the affine geometry,and the form of the sum of the square sum of the conjugate diameter,and given two examples of application.%利用平面解析几何方法,探讨仿射几何有心二次曲线的性质,统一给出共轭直径的线段平方和的结构形式,并且举出应用的实例。
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