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http://www.wolframalpha.com/input/?i=what%27s+the+derivative+of+x+squared+plus+2x+plus+x+cubed http://weibo.com/1657430300/xtmS4CFUc
posted @ 2012-07-16 16:10  adodo1  Views(92)  Comments(0)  Edit  收藏  举报