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Discuz Math Forum»Forum › Mathematics › High School › 椭圆里是如何说明极点在主轴上则极线垂直于主轴的
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[几何] 椭圆里是如何说明极点在主轴上则极线垂直于主轴的

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isee

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isee posted 2020-7-30 18:13 |Read mode
RT

写2020年全国1卷第20题，引出的，我确实给忘记了。
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