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标题: GWD8-37(讨论中没有) [打印本页]

作者: liuxindou 时间: 2004-11-26 02:59
标题: GWD8-37(讨论中没有)

37. One gram of a certain food contains 7 percent of the minimum daily requirement of vitamin E and 3 percent of the minimum daily requirement of vitamin A. If vitamin E and A are to be obtained from no other source, approximately how many grams of the health food must be eaten daily to provide at least the minimum daily requirement of both vitamins?

A.3 B.7 C.10 D.14 E.33

有劳NN们了，谢谢！

作者: blackhorse 时间: 2004-11-26 10:48
选E。估计你没有读懂题目，建议你再看看。答案＝1/3%＝33。

作者: madtonyson 时间: 2008-2-18 11:40

可以麻煩解釋一下這題嗎?? 謝謝^^

作者: howren 时间: 2008-2-19 05:30

１克里含７％所需要的最小量E,假设，每天需要最小量E为X，那么

１＝７％X　X=100/7

同理，每天所需A为Y,　Y=100/３

为了满足两者都有，最小值取１００／３．（因为１００／３＞１００／７，已经涵盖了E)

应该很清楚了吧！

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