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Home / 但价格均为 \( p = 1000/n \)，出售数量为 \( x \)，则：

但价格均为 \( p = 1000/n \)，出售数量为 \( x \)，则：

February 22, 2026

$但价格均为 \( p = 1000/n \)，出售数量为 \( x \)，则：$

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但题目问的是最初卖出的是多少美元，即初始股票售价是否为1000美元的25%上涨后的一部分？
设初始买入为1000美元，价格 \( p = 1000 / n \)，售出部分发现剩余价值800美元，因此卖出部分价格为：
\[ \frac{800}{n_{\text{rem}}} \]
\[ x \times (1.25p) = \text{总售出金额} \]
\[ (n - x) \times p = 800 \]
\[ n - x = \frac{800}{p} = \frac{800n}{1000} = 0.8n \Rightarrow x = 0.2n \]

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