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Re:我是这样推的。。

Posted by tanjing at 2010-08-27 20:01:06 on Problem 2506
In Reply To:Re:我是这样推的。。 Posted by:tanjing at 2010-08-27 19:59:54
非常佩服你的数学能力,二阶常系数线性方程早忘了。。。。

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