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股票A: \sigma_A = 1\% ;股票B: \sigma_B = 2\% 。50-50投资组合,零相关。投资组合方差。
股票A: \sigma_A = 1\% ;股票B: \sigma_B = 2\% 。50-50投资组合,零相关。投资组合方差。
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