吾-1: 放物線と接する円 吾 2013.07.07(Sun) Question Answer Comments 6 cexen 難易度A** 2013.08.29(Thu) 01:15.53 Name: Passphrase: Comment: (Passphrase知らない人はCexen-3: Passphraseのための問題②でどうぞ)
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