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- 2011-7-11
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(1 + a) / (1 + b) is approximately equal to a-b when a and b are relatively small #s.
so you could do it either the long way as 1.02/1.07 or (1-0.05) and as you yourself have attested the number is not a whole lot different, in the final analysis.
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发表于 2011-7-11 15:19
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