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六年级奥数思维训练，运用逆推的策略，找出题目中存在的规律
第21讲逆推策略（三）：有54张扑克牌，两个人轮流拿牌，每人每次只能拿1－4张，谁取最后一张谁就输。问先拿牌的人怎样才能保证获胜？
六年级奥数思维训练88/114
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