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所有跟帖:
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答案是1.5根号5
-徙倚彷徨神光离合-
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04/25/2025 postreply
07:20:11
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GC^2=2,GD^2=20,DF=3/4 * 2*5^1/2
-3-D-
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04/25/2025 postreply
07:49:29