文已知椭圆的左焦点为右顶点为点在椭圆上且轴 直线交轴于点.若则椭圆的离心率是 A. B. c. D. 理已知是椭圆的 Template




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tomski文已知椭圆的左焦点为右顶点为点在椭圆上且轴 直线交轴于点.若则椭圆的离心率是 a. coloring