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Let's say this is r1, this is r2 r1 r2 r3 r4 and then this will be r3 and this will be r4.
那么我们可以2,依次把它们称为。
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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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$firstVoiceSent
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