3.1.1 椭圆及其标准方程（P108 图3.1-6 例3 斜率之积为负常数的点的轨迹）

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  1. 选修 3.1.1 椭圆及其标准方程（P108 图3.1-6 例3 斜率之积为负常数的点的轨迹） (.ggb)