明日考试，几道JJ不懂，盼解！！

v521

212. each bread needs 2/3 cup of milk. Total milk is 2.25 cups . After making two breads, how many cups of milk do   leave ?   

Ans 3/4 - 1 (range)   9/4-4/3=11/12   3/4~1

215. the number of M men and the number of W women were selected to be members of one club last year. If all of the members are still in the club. Whether there is higher percentage of women joining the club this year?  

1) M/2 + X  = W/2 + X    X is constant         

2) W> M                              （C）

216.  rounded to 10,000.  X = 140,000; Y= 80,000. What is X+Y rounded to 10,000  

1) actual numbers of X and Y are within 2% of 140,000 and 80,000, respectively.

2) X rounds up and Y rounds down (not sure which one rounds up which one rounds down)

此题说的什么意思？

221. K 是 positive integer,  5^k  是  the factor of the product of the 99-199,

求 k 的 value？

1） K/2余1
2） K/3余2

99*100*-----*199
中间能被5整除的数字是100、105、110---195，一共20个数字

其中100=5^2*4,125=5^3,150=5^2*6,175=5^2*7

所以the product of the 99-199 的factor=5^(20+1+2+1+1)

k=25

此题选E？

zijunandyy

呵呵,我也是明天济南.第一题11/12是不是大于3/4=9/12,而小于1=12/12啊?其实问的就是11/12在给出的答案中的哪个区间内,它没有直接给11/12这个答案而已啦!

第二题我也在问啊,至今没有回音的说~~只有等看到题现场算了~~`

第三题其实蛮简单的,就是说如果四舍五入到10,000的话，X是140,000,Y是80,000,然后问X+Y 四舍五入后到10,000为多少?

根据条件一,你可以分别算出X和Y的真实值的范围,我就不具体写了,然后把X的可能取的最大值和Y可能取的最大值相加,再四舍五入到10,000,我记得是220,000,好象~~然后再把X和Y可能取的最小值相加,结果四舍五入后还是220,000,反正四舍五入后结果都一样,所以条件一成立;

根据条件二,X rounds up 是说X那140,000是进位进来的,也就是说X的真实值是135,000-139,999之间,同理,Y rounds down ,是说Y的80,000是舍掉以后的,也就是说Y的真实值是80,000-84,999之间,然后同样把看X和Y的最大值相加,最小值相加后是不是能够四舍五入为相同的结果,计算后发现四舍五入后都是220,000.因此条件二也成立.

因此选D

第三题我也不是非常明白,但用笨办法算了一下,就是一个个列出99-199间5的倍数,然后数了数5的最高次幂,好象是20几来的,而条件一条件二结合后是K=6A+5,所以K可以取A=1,K=11;A=2,K=17;A=3,K=23等等,不是唯一值,因此我选E.

加油哦明天!

PS:欢迎到我们老校来

v521

我8号已经去过一次了。。。这次不要再停电了。。。

zijunandyy

应该不会了吧~~你实在是太幸运了,呵呵不过那个耳机不太舒服啊带上,不知道能不能自戴耳塞?

v521

没有耳塞，只有耳机，我上次直接没带

zijunandyy

对了,你看到广州的机经那个帖子了吗? 有一题和讨论的不太一样啊:

给出X, Y, Z取值范围，-13 <X<13; 12<Y<33; 5=<Z<=15,求XYZ的可能值

作者说没有25*20*11那个答案~~

v521

我上次考到这个题了，我估计也是按照JJ上算的，但是没有答案。。。我以为当时哪算错了。。。弄不懂，应该是那样算的。。。

zijunandyy

还有那个233题X算出来不是整数呀!是不是数字有误?方法没有问题吧?

v521

Although the earliest surviving Greek inscriptions written in an alphabet date from the eighth century B.C., a strong case can be made that the Greeks actually adopted alphabetic writing at least two centuries earlier.  Significantly, the text of these earliest surviving Greek inscriptions sometimes runs from right to left and sometimes from left to right.  Now, the Greeks learned alphabetic writing from the Phoenicians, and in the process they would surely have adopted whatever convention the Phoenicians were then using with respect to the direction of writing.  Originally, Phoenician writing ran in either direction, but by the eighth century B.C. it had been consistently written from right to left for about two centuries.

In the argument given, the two portions in boldface play which of the following roles?

1. The first is the position that the argument seeks to establish; the second reports a discovery that has been used to support a position that the argument opposes.


2. The first is the position that the argument seeks to establish; the second presents an assumption on which the argument relies.


3. The first presents evidence that is used in support of the position that the argument seeks to establish; the second presents an assumption on which the argument relies.

  D. The first is an objection raised against a position that the argument opposes; the second is the position that the argument seeks to establish.

  E. The first is an objection raised against a position that the argument opposes; the second is evidence that has been used to support that position.

次题bold最后一句以后选啥？我觉得还是B吧？

v521

应该没问题吧，我没具体算，好像那个题有好几个版本