回複：印度同事出的題，瓦爺用了5妙鍾，都來試試。

來源: 於 2010-04-21 12:33:04 [舊帖] [給我悄悄話] 本文已被閱讀：次

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