<div><img src="http://163.26.206.177/system/uploads/de07b28eaf7c9c67f33323c6a8e84d6e4cbc6cae.gif" width="745"><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div>【相關解法】http://www.mathchina.net/dvbbs/dispbbs.asp?boardid=7&amp;Id=5121<br>