原名:TWENTY-SIX YEARS OF PROBLEM POSING: – Peter Liljedahl 作品简介:自 1971 年第一届数学基础暑期学校以来，我们数学思维在猜测的氛围中发挥得最好，而且…… 资源下载包年VIP免费升级包年VIP 0 0 摆姿势
原名:TWENTY-SIX YEARS OF PROBLEM POSING: – Peter Liljedahl 原名:TWENTY-SIX YEARS OF PROBLEM POSING: – Peter Liljedahl 
