寻找2005/01月份战友,一起准备2004/01的Math JJ

westlakegz

以下是引用hpp920在2005-1-8 13:59:00的发言：
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天，我居然忘了mike本人，好粗心！！！

hpp920

妳漏掉了一句喔!
这里是说12个数字，either偶数 or可以让5整除…

终于看懂了题,读JJ还真得有点辨别歧意的本事!!! 谢谢了!

windweed

这几题对下答案:

2, The total cost of something includes the original price and tax, tax is what percent of the price?

  1) total /price=1.03

  2) tax=10

  我选A

3) w=k/r^2, when r=4000, w=200, what is the approximate value of w when w=4600

题目是不是有问题啊?

6) there are some blue and red marbles in a box, what is the probability that draw a blue marble from the box?

   1) the number of blue marbles is 10 percent more than that of red one.

    2) there are 15 red marble in the box

  我选C

9)  there is a team in a club, the number of the member in the team is more than 10 but less than 40, if these guys sit around the table by 4 each table, then 4 of them will be left out, if they sit around the table by 5 each table, then 5 person will be left out, as if they sit around the table by 6 each table , how many will be left out?

思路: 4(x-1)+3=5(y-1)+5   为什么是(x-1)?  是不是因为是围着圈做的原因就要-1?

10) five minorities 那题, 我觉得9 都行的通. 答案可能有问题.

281)  281.PS 有兩座城市X, Y共用一座發電廠的電. X的耗電功率(千瓦/小時) 為Y的3倍, 但兩城市的用電量一樣多, 問若X城市的用電量為發電廠的K percent, 那麼Y城市的用電量為多少percent? (這題"用電量"有兩個單字, 不好分辨不知是否代表的意義不同)
1)2/3K
2)3/2K
3)1/2K
4)2k
5)3K
这题, 用电量和耗电功率的关系不明白,不会做.

爱维的天

大家加油啊!还有3天就复习完了…

1/9  265~282题
        http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=34676

昨天没讨论完的题目，大家再继续讨论吧!
题目最好都先思考过，考试时比较有印象；
提问时将自己的思路和算式写出来，可以帮助大家讨论问题在那里，找到思路和算式错往往是最难的…

有问题的题目，在这个贴子提出来，不要回复在去年的讨论稿，会把去年的讨论稿顶出来，和今年的讨论稿搞混。

前面的部分，wawa有帮大家整理了精华，见150楼，若跟上进度在作前面的部分可以参考…
跟着讨论，有问也有答才能帮助厘清思路…，有时候一些思路自己错都不知道，讨论后才发现…

爱维的天

以下是引用windweed在2005-1-9 9:39:00的发言：

这几题对下答案:

2, The total cost of something includes the original price and tax, tax is what percent of the price?

  1) total /price=1.03

  2) tax=10

  我选A

3) w=k/r^2, when r=4000, w=200, what is the approximate value of w when w=4600

题目是不是有问题啊?

6) there are some blue and red marbles in a box, what is the probability that draw a blue marble from the box?

   1) the number of blue marbles is 10 percent more than that of red one.

    2) there are 15 red marble in the box

  我选C

9)  there is a team in a club, the number of the member in the team is more than 10 but less than 40, if these guys sit around the table by 4 each table, then 4 of them will be left out, if they sit around the table by 5 each table, then 5 person will be left out, as if they sit around the table by 6 each table , how many will be left out?

思路: 4(x-1)+3=5(y-1)+5   为什么是(x-1)?  是不是因为是围着圈做的原因就要-1?

10) five minorities 那题, 我觉得9 都行的通. 答案可能有问题.

281)  281.PS 有兩座城市X, Y共用一座發電廠的電. X的耗電功率(千瓦/小時) 為Y的3倍, 但兩城市的用電量一樣多, 問若X城市的用電量為發電廠的K percent, 那麼Y城市的用電量為多少percent? (這題"用電量"有兩個單字, 不好分辨不知是否代表的意義不同)
1)2/3K
2)3/2K
3)1/2K
4)2k
5)3K
这题, 用电量和耗电功率的关系不明白,不会做.

2)Agree A
3)题目有问题，前面有讨论过…
6)我选﹙A﹚，小鱼去年的讨论稿有算式，﹙A﹚应该没问题…
   算式如下：
   A 同意 zida  B-R=10%R => B=1.1R,   B/(B+R)=B/(B+B/1.1)=11/21
9)原JJ下有一段话说明x、y代表原状况的桌数，也
   可以不用减1﹙但假设即不同﹚，如下
  4a+3=5b+5，同样可得人数为15或35人，答案为3人或5人。
10)答案是9，应该没错…
281)还没作到…

bettyamen

1月9号的题好象比较容易搞掂。但还是有些题 不懂。

268.机经题：长方体内边三边长为x，y，z，厚度为一，问体积
. 小鱼评价： (x+2)(y+2)(z+2)-xyz

这题不知道问体积为何要减去xyz,who could tell me

277. in the parallelogram shown, pq=4, qr=6,angleqps is 30 degree, what is the area of  pqrs?

已知道一个角度，求对应的边长，难道要用到含数。怎么算呵，

281，不懂

aokceo

265.x<10, y<10, what is the range of x/y?
  A. 8, B.9; C. 80/9; ...........(can't remember the other two)
. 小鱼评价： 题目不全，在这里不知道x,y是否大于0。 可以取无穷大或者无穷小
266.Need to use 1.5 feet metal (can't break it)to made a machine, 4 feet per roll. So need how many rolls to make 8 machines?
. 小鱼评价： 题目没看明白
268.机经题：长方体内边三边长为x，y，z，厚度为一，问体积
. 小鱼评价： (x+2)(y+2)(z+2)-xyz
      
269.某人工作三十个小时，前x小时报酬为8元，之后每小时为12元，问那个为可能的工资值，好像是280
. 小鱼评价： x.8+(30-X).12=280
270.（62题）：what is the sum of a certain pair if consecutive odd integers?
(1) at least one of the integers is negative
(2) at least one of the integers is positive
作者答案及思路：ans: c
. 小鱼评价： C
271.（173题）: if y is the smallest positive integer such that 3150 multiplied by y is the square of an integer, then y must be:
a.2  b. 3  c.7   d. 4  e. 14
作者答案及思路：ans: e.14
. 小鱼评价： 分解因子。14
272． the surface of a certain planet reflects 80 percent of the light that strike it. the  clouds around the planet then absorb 40 percent of the reflected light. what percent of the light that strikes the planet is reflected from the surface and passes trough the clouds without being absorbed?
作者答案及思路：ans: 40%
. 小鱼评价： 80%*60%=48%
273． if x>1 and y>1, is x<y?
(1) x^2/(xy+x)<1
(2) xy/(y^2-y)<1
作者答案及思路：ans: e
. 小鱼评价： B
274. in a meeting of 3 representatives from each of 6 different companies, each person shook hands with every person not from his or her own company . if the representatives did not shake hands with people from their own company, how many handshakes take place?
作者答案及思路： ans:135
. 小鱼评价： C2,18-6c2,3=135

另外一种方法：C1，6*C1，3*C1，5*C1，3 /P2，2=270/2=135
275.from a group of 3 boys and 3 girls, 4 children are to be randomly selected. what is the probability that equal numbers of boys and girls will be selected?
  作者答案及思路：ans: 3/5
. 小鱼评价： c2.3.c2,3/c4.6=3/5
276.the first roll of a cinema has 16 seats, the roll immediately after the first roll has 2 more seats than the first roll. every roll has two more seats than the roll immediately in front of it. the last roll of has 64 seats. how many seats does this cinema have?
  作者答案及思路：ans: 1000
. 小鱼评价： 等差数列。1000
277. in the parallelogram shown, pq=4, qr=6,angleqps is 30 degree, what is the area of  pqrs?
   
         q  ______________r
           /l                  /
         /  l                 /
p     /__l____________/s
（图形可能会变形，那三个1是我想画的平行四边行的高，请大家将就一下吧）
. 小鱼评价： 12
278. a scientist recorded the number of eggs in each of the 10 birds' nests, what was the standard devition of the numbers of eggs in the 10 nests?
(1) the averge (arithmetic mean) number of eggs for the 10 nests was 4
(2) each of the 10 nests contained the same number
作者答案及思路：ans: b
. 小鱼评价： B
279. the base of a retangular solid tank is a square, the length of each side of the square is 4 meters, the altitude of the tank is 6, if there is 16 cube meters water in the tank, what is the rate of the volume of water in the tank to the volume of the retangular solid tank?
作者答案及思路：ans: 1/6
. 小鱼评价： 1/6
281.PS 有兩座城市X, Y共用一座發電廠的電. X的耗電功率(千瓦/小時) 為Y的3倍, 但兩城市的用電量一樣多, 問若X城市的用電量為發電廠的K percent, 那麼Y城市的用電量為多少percent? (這題"用電量"有兩個單字, 不好分辨不知是否代表的意義不同)
1)2/3K
2)3/2K
3)1/2K
4)2k
5)3K
這題沒做出來, 希望後人能補充
. 小鱼评价： 题目不全，没看明白

应该是用电时间一样多，

设时间为T ，电厂总量为E ，那：X*T=E* K ，代入X=3Y  》》3YT=EK ，YT=1/3EK。

所以是1/3K 。可没有该答案

282. DS 有一平行四邊形 四個角ABCD, 四邊全等, 問是否可以知道對角線BD長為多少?
1)AD邊的長度為2
2)AC對角線長度為2
作者答案及思路：My ANS C
. 小鱼评价： C

helenefz

以下是引用bettyamen在2005-1-9 14:05:00的发言：

1月9号的题好象比较容易搞掂。但还是有些题 不懂。

268.机经题：长方体内边三边长为x，y，z，厚度为一，问体积
. 小鱼评价： (x+2)(y+2)(z+2)-xyz

这题不知道问体积为何要减去xyz,who could tell me

其实这里并不很明确求的是哪部分的体积。减xyz之后得到的是两个长方体之间实在部分的体积。前面讨论过。

277. in the parallelogram shown, pq=4, qr=6,angleqps is 30 degree, what is the area of  pqrs?

已知道一个角度，求对应的边长，难道要用到含数。怎么算呵，

在直角三角形内30度所对的直角边等于斜边的一半。然后用勾股定理算出高。或者可以用正余弦，我不记得了。所以都是用第一种方法做的。

aokceo

(E)9
我觉得﹙E﹚9没问题啊!
J+K+M=50-2-50*21/100=37.5
J>=K>=L=10.5
M<=L=10.5
M=9，J+K=37.5-9=28.5
即使均分，J=K=14.25>M  >>  OK.

题目肯定有问题，由L=10.5，N=2 ，N〈=M〈=L ，答案选项中最大的是9 ，所以E。

if the question is not wrong ,then i must be a fool or the GMAT is designed to treat fools .

beautywawa

266.Need to use 1.5 feet metal (can't break it)to made a machine, 4 feet per roll. So need how many rolls to make 8 machines?

介一題,,答案我覺得是3,可是討論稿上有3 也有4,,到底是什麼?

discussion...