[几何] 关于主轴的对称点与中心的连线

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hbghlyj posted 2021-4-27 21:16 |Read mode

Last edited by 2021-4-27 21:18点A关于椭圆的极线为$\ell$,A关于主轴的对称点为A′,过A作$\ell$的垂线交OA′于B,求证$\frac {OB}{OA}=\frac{a^2-b^2}{a^2+b^2}$.
QQ图片20210427211752.png

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2025-6-8 05:22 GMT+8

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