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应用均值－方至理论分析了共同基金投资组合的风险和收益，证明了基金在维持较高期望收益的前提下，可通过分散投资实现总资产风险最低．
Applying the means-to-theory to analyze the risk and return of the mutual fund portfolio, it proves that the fund can achieve the lowest risk of total assets through decentralized investment while maintaining the high expected return.