以c为半径的圆上一点与两焦点的连线分别交椭圆ab和cdabcd交于点q证明q在y=b^2c上? 知乎 Template




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tomski以c为半径的圆上一点与两焦点的连线分别交椭圆ab和cdabcd交于点q证明q在y=b^2c上? 知乎 coloring