二次曲线定点弦的中点轨迹也是同型二次曲线(如图)有什么更接�本质的解释吗(比如射影几何的解释)? 知乎 Template




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tomski二次曲线定点弦的中点轨迹也是同型二次曲线(如图)有什么更接�本质的解释吗(比如射影几何的解释)? 知乎 coloring