回複：印度同事出的題，瓦爺用了5妙鍾，都來試試。

來源: wu2ming2 於 2010-04-21 12:33:04 [] [舊帖] [給我悄悄話] 閱讀數 : (126 bytes)

This should not be a tricky question. "+" should be replaced with an unknown operation (?) to make it a valid math exercise.

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