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活動一:大顯身手 如圖所示,把10元硬幣和5元硬幣各自排4枚。每次移動硬幣時,要同時把鄰邊的硬幣,合共2枚一起移動。但切記不可把2枚硬幣左右調動,或排
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Document Date: 2006-05-23 03:56:37


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