数学机经258题有定论了没？

xkyanglin · 发表于 2010-11-10 22:00:24

258: DS 题一个账户只能干三件事取500 存400和存 300 。问这个月这个账户是不是最少存取了十次
条件一：这个月以上三件事每个都最少做了一次
条件二：这个月比上个月多了1600元

这道题大家怎么看？我是一头雾水。。。。。。

sdcar2010 · 发表于 2010-11-10 22:33:14

-500, -1000, -1500, -2000
400, 800, 1200, 1600, 2000
300, 600, 900, 1200, 1500, 1800, 2100.

Condition 1. At least once. -500 + 400 + 300 = 200. Three times. There is no way you can answer if this month the account holder had at least 10 transactions. Not sufficient.

Condition 2. Sixteen hundred more this month. Well, if the account holder made 4 deposits of 400 each, he/she would have 1600 more. Not sufficient.

Combine both conditions. At least once. -500 + 400 + 300 = 200. Sixteen hundred more this month. Three transaction gives 200 more. 1600 - 200 = 1400. Then the question is can you use 6 or fewer steps to get a 1400 by a combination of the three transactions. 400 x 4 + 300 - 500 = 1400. Only 6 steps. So combining both conditions is not sufficient, either.

angela7258 · 发表于 2010-11-14 15:03:12

这种题我考试的时候肯定直接就选E了...如果原题问的是“是否”最少存取十次，答案可以是“是”也可以是“否”，B直接就可以推出“否”，所以似乎应选B?

数学机经258题有定论了没？

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