通常的书本长宽的比是多少？为什么？
数学趣味题：书本的长宽比是多少？
于德利 (2008-01-03 20:20:34) 评论 (1)通常的书本长宽的比是多少？为什么？
海外博客
数学趣味题：书本的长宽比是多少？
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