为什么椭圆内中点弦和等比例缩放后的椭圆(离心率一致)相切且切点是原中点? 知乎 Template




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tomski为什么椭圆内中点弦和等比例缩放后的椭圆(离心率一致)相切且切点是原中点? 知乎 coloring