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国人有个问题搞不懂,想请奥巴马总统的智廊团解答。

Created by X.L. on May 12, 2013

一个人花8元钱买只鸡,然后9元钱卖了,他觉得不划算又用10元钱买回来然后11元钱卖掉,请问他最后亏还是赚了?亏多少?赚多少?

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