需要證明。否則就是附加的己知條件。
所有跟帖:
• 四邊形就要四點共圓。 -15少- ♂ (74 bytes) () 03/06/2023 postreply 14:41:16
• 四邊形就要四點共圓。 -15少- ♂ (74 bytes) () 03/06/2023 postreply 14:41:16
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