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[几何] 一道立体几何的疑惑

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hjfmhh Posted at 2025-4-6 18:54:35 |Read mode

疑惑：（1）答案是B，算出来是C,不知道为啥，错在哪里？（2）不用建系，有没有传统的几何法.请大神指教，

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