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[原创]11月2日 北美机经新鲜出炉

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21#
发表于 2006-11-3 22:46:00 | 只看该作者

13,一个数字除以三余数是1,除以10余数是2,问除以30的余数

上个月JJ的变形,求通项公式:

1, X=3a+1

2, X=10b+2

=>X=30n+22 ;所以X除30余22

22#
发表于 2006-11-3 23:02:00 | 只看该作者
第10题:3黄车之间不能算排列,因为不可分辨也就是颜色一样,答案应为:P55 /P33
23#
发表于 2006-11-3 23:11:00 | 只看该作者
以下是引用xiangqinzh在2006-11-3 20:45:00的发言:

13,一个数字除以三余数是1,除以10余数是2,问除以30的余数

22(符合条件的数有22,52,82。。。)

同意你的全部答案,但13题好象有其它推理方法,我不知道,谁能够推推呢

除以10余2 可得个位为2  因为被3整除的数所有位数加起来可以被3整除 故在这个数的非个位数之和加1后可以被3整除(因为除以3余1且个位为2)可知,若把个位变为0,十位加1(即加了10),新数可被30整除 故 可知原数除以30后余20+2=22

说得有点乱 不知大家能不能看懂 简单一点的话 把这个数限定位两位数 就比较简单了

24#
发表于 2006-11-3 23:21:00 | 只看该作者
以下是引用cusimon在2006-11-3 22:46:00的发言:

13,一个数字除以三余数是1,除以10余数是2,问除以30的余数

上个月JJ的变形,求通项公式:

1, X=3a+1

2, X=10b+2

=>X=30n+22 ;所以X除30余22

这个偶反而看不明了。。。

25#
发表于 2006-11-3 23:25:00 | 只看该作者

请教一下,通项公式应该如何求啊?有无简单方法?谢了先!

26#
发表于 2006-11-4 00:13:00 | 只看该作者
以下是引用xiangqinzh在2006-11-3 20:48:00的发言:

LZ的CR是这道

1.         T-9-Q3.
    

Business Consultant: some corporations shun the use of executive titles because they fear that the use of titles indicating position in the corporation tends to inhibit communication up and down the corporate hierarchy. Since an executive who uses a title is treated with more respect by outsiders, however, use of a title can facilitate an executive’s dealings with external businesses. The obvious compromise is for these executives to use their corporate titles externally but not internally, since even if it is widely known that the corporation’s executives use executive titles outside their organization, this knowledge does not by itself inhibit communication within the corporation.

 

In the consultant’s reasoning, the two portions in boldface play which of the following roles?

 

  1. The first presents an obstacle to achieving a certain goal; the second presents a reason for considering that goal to be undesirable.

  2. The first is a consideration that has led to the adoption of a certain strategy; the second presents a reason against adopting that strategy.

  3. The first describes a concern that the consultant dismisses as insignificant; the second is a consideration that serves as the basis for that dismissal.

  4. The first is a belief for which the consultant offers support; the second is part of that support.

  5. The first is a belief against which evidence is offered; the second is part of the evidence offered against that belief.

B     

Answer is B.

27#
发表于 2006-11-4 09:14:00 | 只看该作者

给了6个确定的数字和X,应该是2 3 4 5 7 9 和X.问X是不是>=4  条件1:median 是4,条件2是X比median大

answer: D

1 x<4

2 x>4

28#
发表于 2006-11-4 09:33:00 | 只看该作者
why Q9's answer is D?!
29#
发表于 2006-11-4 10:00:00 | 只看该作者
以下是引用2006gmat2006在2006-11-4 9:14:00的发言:

给了6个确定的数字和X,应该是2 3 4 5 7 9 和X.问X是不是>=4  条件1:median 是4,条件2是X比median大

answer: D

1 x<4

2 x>4

(1)推出x<=4

我选B

30#
发表于 2006-11-4 15:21:00 | 只看该作者
以下是引用unclekin在2006-11-4 10:00:00的发言:

(1)推出x<=4

我选B

1)推出x<=4 ,也就是说x不是>=4,所以也是充分的啊。

倒是第7题的(1)怎么能推出在3小时以内呢。200mile=321.8kilometer啊。

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