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The return on the portfolio is x1 r1 + x2 r2 + x3 r3.
这个投资组合的收益是。
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.. The portfolio expected return-- x3 we have to choose three things now: x1, x2, and x3.
要计算投资组合的预期收益-,我们必须确定三个值x1，x2和。
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