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我認為答案是69.因為8乘以8等於54是正確的,可以判斷出這裡的54應該等於十進位裏的64,假設為N進制,則5*N+4=64,求出N=12.而9乘以9在十進位結果是81,換算成12進制為69.我想要分
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