如圖 http://imgur.com/a/2DARP
試過二項式定理……
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推
08/05 00:03, , 1F
08/05 00:03, 1F
推
08/05 00:18, , 2F
08/05 00:18, 2F
推
08/05 00:40, , 3F
08/05 00:40, 3F
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