过准线和x轴的交点作一条直线和椭圆交于ab,联结aff是对应焦点并延长与椭圆交于c点,b与c? 知乎 Template




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tomski过准线和x轴的交点作一条直线和椭圆交于ab,联结aff是对应焦点并延长与椭圆交于c点,b与c? 知乎 coloring