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27人到商场买水喝,遇到商场搞促销,三个空瓶子可以换一瓶水,问27个人,一人一瓶最少 |
发表于 2011-10-14 12:33
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发表于 2011-10-14 23:34
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发表于 2011-10-15 19:49
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发表于 2011-10-19 21:22
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发表于 2011-10-19 21:20
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发表于 2011-12-21 07:50
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