this is from Y H book p238

street0120003 · 2011-04-23 19:41:59Z

this is from Y H book p238簡介

來源: street0120003 於 2011-04-23 19:41:59 [檔案] [舊帖] [給我悄悄話] 閱讀數 : (67 bytes)

This funny math is from Y H book,P238...the beauty of Math!!

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