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本文利用未确知有理数的数学期望值方法进行企业投资方案决策，在理论上可行、所得结果是可信的．该方法用于多层次决策，过程直观，方法有效。
In this paper, we use the mathematical expectation method of unascertained rational number to make decision of enterprise investment scheme, which is theoretically feasible and the result is credible. The method is used for multi-level decision-making, the process is intuitive and the method is effective.