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8元买只鸡，9元卖出去，10元买回来，11元再卖出去，赚了多少钱？

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2018-02-12 11:30

2018-02-12 11:30

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8元买只鸡，9元卖出去，10元买回来，11元再卖出去，赚了多少钱？