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过准线和x轴的交点作一条直线和椭圆交于ab，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ab，联结aff是对应焦点并延长与椭圆交于c点，b与c？ 知乎 coloring
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