EFDG 以DE對稱不是顯然的吧?如何證的?
所有跟帖:
• check here. -longsky- ♂ (228 bytes) () 11/07/2016 postreply 19:41:24
• check here. -longsky- ♂ (228 bytes) () 11/07/2016 postreply 19:41:24
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