因為BD對O旋轉對稱
所有跟帖:
• 您的ABCD是任取的,BD不一定過O點...過O點要證明. -jinjing- ♀ (0 bytes) () 06/30/2011 postreply 08:04:12
• 您恐怕沒看懂 -說了就走- ♂ (234 bytes) () 06/30/2011 postreply 10:18:25
• 您的ABCD是任取的,BD不一定過O點...過O點要證明. -jinjing- ♀ (0 bytes) () 06/30/2011 postreply 08:04:12
• 您恐怕沒看懂 -說了就走- ♂ (234 bytes) () 06/30/2011 postreply 10:18:25
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