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标题: [原创]GWD21 MATH答案同大家探讨 [打印本页]
作者: hitlzc    时间: 2006-1-7 13:43
标题: [原创]GWD21 MATH答案同大家探讨

刚做了GWD21的MATH部分，但有些题看不到数字，所以没做。


1C 2C 3A 4D 5D 6A 7C 8D 9.D 10B 11E 12A 13D 14B 15D 16E 17C 18A 19E 20C 21E 22A 23C 24E 25A 26B 27C 28D 29E 30C 31E 32D 33A 34D 35D 36B 37D


为方便看，另一种形式：


CCADD  ACDDB  EADBD ECAEC EACEA BCDEC EDADD BD


[此贴子已经被作者于2006-1-8 8:37:35编辑过]
作者: Youknowme    时间: 2006-1-7 14:07
GWD21 MATH word 版本[attach]44192[/attach]

[此贴子已经被作者于2006-1-7 14:11:11编辑过]
作者: seasnow    时间: 2006-1-7 14:22
我明天做！谢谢分享！
作者: hitlzc    时间: 2006-1-7 15:32
以下是引用Youknowme在2006-1-7 14:07:00的发言：
GWD21 MATH word 版本[attach]44192[/attach]


谢谢美女斑斑！

不好意思，刚才在做VERBAL，才看到帖子。

作者: tomasy    时间: 2006-1-7 15:50

CCADD  ABDDB  EADBD  ECAEE AACEA  CCDEC  EDADD  BD


对下, 不知道对不对?

作者: hitlzc    时间: 2006-1-7 15:56
以下是引用tomasy在2006-1-7 15:50:00的发言：

CCADD  ABDDB  EADBD  ECAEE AACEA  CCDEC  EDADD  BD


对下, 不知道对不对?


等我把剩余未做的部分都做了，再跟MM对。

作者: hitlzc    时间: 2006-1-7 16:38

hitlzc:CCADD  AEDDB  BADBD ECAEC EECEA BCDBC EDADD BD


tomacy:CCADD  ABDDB  EADBD  ECAEE AACEA  CCDEC  EDADD  BD


7/11/20/21/22/26/29不同


[此贴子已经被作者于2006-1-7 17:07:54编辑过]
作者: hitlzc    时间: 2006-1-7 17:16

再看一次的结果


Q7:


In the xy-plane, line a and line b have the same slope.  If the y-intercept of line a is –1, what is the y-intercept of line b ?


(1)     The x-intercept of line a is –1.


(2)     Line b passes through the point (10, 20).


               


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.


B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.


C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.


D. EACH statement ALONE is sufficient.


E. Statements (1) and (2) TOGETHER are NOT sufficient.


认为选C


思路：设line a: y=mx+n, b: y=mx+c,题干知n=-1，求c=?


1)得m=-1


2）10m+c=20


二者结合，才能求出C



Q11:


If n is an integer, is 10n ≤ 0.001 ?


(1)     n ≤ -2


(2)     n > -5


                  


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.


B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.


C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.


D. EACH statement ALONE is sufficient.


E. Statements (1) and (2) TOGETHER are NOT sufficient.


同意tomacy,选E



Q20:


Of the 60 animals on a certain farm, 2/3are either pigs or cows.  How many of the animals are cows?


(1)     The farm has more than twice as many cows as it has pigs.


(2)     The farm has more than 12 pigs.


                  


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.


B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.


C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.


D. EACH statement ALONE is sufficient.


E. Statements (1) and (2) TOGETHER are NOT sufficient.


仍坚持选C


思路：题干知道pig+cow=60*2/3=40


1)cow>2*pig


2)pig>12


结合有3*pig<40,12<pig<40/3,则pig=13


Q21:


A store purchased a Brand C computer for the same amount that it paid for a Brand D computer and then sold them both at higher prices.  The store’s gross profit on the Brand C computer was what percent greater than its gross profit on the Brand D computer?


(1)   The price at which the store sold the Brand C computer was 15 percent greater than the price at which the store sold the Brand D computer.


(2)     The store’s gross profit on the Brand D computer was $300.


                  


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.


B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.


C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.


D. EACH statement ALONE is sufficient.


E. Statements (1) and (2) TOGETHER are NOT sufficient.


仍坚持选E


并没说成本的关系，怎么会知道利润的关系呢？



Q22:


In triangle ABC, point X is the midpoint of side AC and point Y is the midpoint of side BC.  If point R is the midpoint of line segment XC and if point S is the midpoint of line segment YC, what is the area of triangular region RCS ?


(1)     The area of triangular region ABX is 32.


(2)     The length of one of the altitudes of triangle ABC is 8.


                  


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.


B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.


C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.


D. EACH statement ALONE is sufficient.


E. Statements (1) and (2) TOGETHER are NOT sufficient.


仍坚持选E


1）在缺少条件的情况下，三角形ABX和RCS没有明确的比例关系。


2）知道一个高，并不知道是那个高



Q26:


For each positive integer n, the integer n* is defined by n* = n2 + 1.  What is the value of the positive integer k ?


(1)     When k is divided by 4, the remainder is 1.


(2)     18 ≤ k* ≤ 36


                  


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.


B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.


C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.


D. EACH statement ALONE is sufficient.


E. Statements (1) and (2) TOGETHER are NOT sufficient.


仍坚持选B


2）18 ≤ k* ≤ 36，则18 ≤ k^2+1 ≤ 36,17 ≤ k^2≤ 35,k是正整数，4^2<17,6^2>35,所以只能是5



Q29:同意tomacy,选E


[此贴子已经被作者于2006-1-7 17:33:09编辑过]
作者: hitlzc    时间: 2006-1-7 17:19

现更新答案如下：CCADD  ACDDB  EADBD ECAEC EECEA BCDEC EDADD BD


并在一楼更新


[此贴子已经被作者于2006-1-7 17:19:35编辑过]
作者: tomasy    时间: 2006-1-8 05:16

Q22:


In triangle ABC, point X is the midpoint of side AC and point Y is the midpoint of side BC.  If point R is the midpoint of line segment XC and if point S is the midpoint of line segment YC, what is the area of triangular region RCS ?


(1)     The area of triangular region ABX is 32.


(2)     The length of one of the altitudes of triangle ABC is 8.


                  


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.


B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.


C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.


D. EACH statement ALONE is sufficient.


E. Statements (1) and (2) TOGETHER are NOT sufficient.


仍坚持选E


1）在缺少条件的情况下，三角形ABX和RCS没有明确的比例关系。


-------RS是ABC长度的1/4, SC 是BC的1/4, RC 是AC 的1/4 ===> RSC 是ABC 的1/16


       ABC = 2* ABX ==> 2*32=64 ===> RSC = 4


2）知道一个高，并不知道是那个高


-------两个三角形 share 同一条高.


因此答案是A, 其他都同意, 谢谢hitlzc.

作者: hitlzc    时间: 2006-1-8 08:37
以下是引用tomasy在2006-1-8 5:16:00的发言：

Q22:


In triangle ABC, point X is the midpoint of side AC and point Y is the midpoint of side BC.  If point R is the midpoint of line segment XC and if point S is the midpoint of line segment YC, what is the area of triangular region RCS ?


(1)     The area of triangular region ABX is 32.


(2)     The length of one of the altitudes of triangle ABC is 8.


                  


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.


B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.


C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.


D. EACH statement ALONE is sufficient.


E. Statements (1) and (2) TOGETHER are NOT sufficient.


仍坚持选E


1）在缺少条件的情况下，三角形ABX和RCS没有明确的比例关系。


-------RS是ABC长度的1/4, SC 是BC的1/4, RC 是AC 的1/4 ===> RSC 是ABC 的1/16


       ABC = 2* ABX ==> 2*32=64 ===> RSC = 4


2）知道一个高，并不知道是那个高


-------两个三角形 share 同一条高.


因此答案是A, 其他都同意, 谢谢hitlzc.


明白了，支持选A,谢谢！

作者: seasnow    时间: 2006-1-8 12:26
现在开始做，发个帖子监督自己一下
作者: seasnow    时间: 2006-1-8 14:30
做完了，答案和下载的文件中附的一样！
作者: hitlzc    时间: 2006-1-8 14:50
以下是引用seasnow在2006-1-8 14:30:00的发言：
做完了，答案和下载的文件中附的一样！


MM真棒，全对哦！


我之前还没细看后面有答案呢，刚才对了一下，和一楼的是一样的。


作者: seasnow    时间: 2006-1-8 16:41

Q20:


Of the 60 animals on a certain farm, 2/3ATH o:extrusionok="f" gradientshapeok="t" o:connecttype="rect">ATH>OCK v:ext="edit" aspectratio="t">OCK>are either pigs or cows.  How many of the animals are cows?


(1)     The farm has more than twice as many cows as it has pigs.


(2)     The farm has more than 12 pigs.


                  


A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.


B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.


C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.


D. EACH statement ALONE is sufficient.


E. Statements (1) and (2) TOGETHER are NOT sufficient.


仍坚持选C


思路：题干知道pig+cow=60*2/3=40


1)cow>2*pig


2)pig>12


结合有3*pig<40,12<pig<40/3,则pig=13


这题我做错了，同意以上分析！


其他的题目下载的文件中的答案都没有问题。

作者: 谢沁薇    时间: 2006-5-30 11:36

抱歉想再问一下22题（见11楼）的1，2。

1）-------RS是ABC长度的1/4, SC 是BC的1/4, RC 是AC 的1/4 ===> RSC 是ABC 的1/16

ABC = 2* ABX ==> 2*32=64 ===> RSC = 4  

可这不是面积么？怎么可以这样边长相乘来比？

还有2）， 大三角形和里面的小三角怎么share同一条高呢？

作者: 谢沁薇    时间: 2006-5-30 12:02

２１题　hitlzc　说：仍坚持选E

并没说成本的关系，怎么会知道利润的关系

小姐姐，问题在于，成本不就是他的进价么？　那么进价相同　Ａ不就是答案？？


[此贴子已经被作者于2006-5-30 12:02:17编辑过]
作者: 谢沁薇    时间: 2006-5-30 18:43
hitlzc 姐姐在么？
作者: hitlzc    时间: 2006-5-31 09:00
以下是引用谢沁薇在2006-5-30 11:36:00的发言：

抱歉想再问一下22题（见11楼）的1，2。

1）-------RS是ABC长度的1/4, SC 是BC的1/4, RC 是AC 的1/4 ===> RSC 是ABC 的1/16

ABC = 2* ABX ==> 2*32=64 ===> RSC = 4  

可这不是面积么？怎么可以这样边长相乘来比？

hitlzc:

是面积。可是△ABC和△ABX,分别以AC和AX为底边的话，高是同一条。

△ABC和△RSC是相似三角形。

还有2）， 大三角形和里面的小三角怎么share同一条高呢？

hitlzc:此题选A,所以2）的解释参考我上面，是不能确定这个8是哪个高的。但如果是垂直于AB上的高，与△RSC的高是在一条直线上，且高的比例为1：4。因为不能确定是此高，所以不确定。


[此贴子已经被作者于2006-5-31 9:04:58编辑过]
作者: hitlzc    时间: 2006-5-31 09:22

21。现在看来我当时理解是有一定偏差的。实际上应为不知道成本和卖价之间的数量关系。

设C和D成本均为X,卖价分别为1.5Y和Y

则题干所求为为（1.5Y-X)/(Y-X)，无法求出具体结果。





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