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hbghlyj 发表于 2023-1-26 13:01 g = M的横坐标 (图中是负的)
hbghlyj 发表于 2023-1-26 13:01 且 $h = \sqrt{\tan ORH} = \sqrt{RH的斜率} = BE = DA$.
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2025-7-21 11:51 GMT+8
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