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標題:

a difficult circle problem

發問:

http://www.flickr.com/photos/47490496@N04/4350719775/sizes/o/ 問題係呢個網,請click入去~

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最佳解答:

==================================================== 圖片參考:http://img254.imageshack.us/img254/699/88545150.png 2010-02-13 12:47:19 補充: http://img254.imageshack.us/img254/699/88545150.png

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