趣味數學 - 拼圖

By Emily
at 2009-04-05T21:42
at 2009-04-05T21:42
Table of Contents
大家好
剛剛有朋友用msn問我
如何使 1,1,9,9用加減乘除,使最後結果等於10
想了好久還是想不到or2
朋友也不知道答案@@
有人知道為什麼嗎?
感謝
(因為很好沒有解決感覺有一個東西一直懸在那)
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拼圖
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