How can you make 6 out of three 7's?怎么翻译

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How can you make 6 out of three 7's?怎么翻译
1个回答 分类:英语 2014-11-29

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一道数学脑筋急转弯,三个七怎样能得六7- (7/7)=6!
 
 
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