谢谢LZ 不要灰心啊
第5题的图有点看不懂
M50,V26
很郁闷,VERBAL从来没错这么多过,只有26...崩溃了...............................现场考还是把握不好PACE..唉``
谢谢CDER,该我回报点了
Math:
1. 有50%教法语，有56%教数学，且28%这两项都教，问neither的percentage?
2. x/y<0? 1.y>0 2.y/x<0
3. n被15除的余数？ 1。N被5除余(数字忘了) 2.N被6除余（也忘了）
4.
5.
6.A机器的效率是B的3/4,A和B一起完成一个东西要6小时,问B单独完成要多久
RC：
1． 通货膨胀和经济政策的关系，GWD里有
2． 关于英语的2种类型的书的区别和联系：一种偏向语法，另一个teach u how to talk and write
3． T的一个关于影响美国黑人community的理论，他认为是economy impact，而别的学者认为是industry and ubanalizion和Great Migration
谢谢楼主分享啊！
LZ不要灰心啊！
谢谢
我想，实战还是和模考时有差别的.我是26号一战，请问LZ模考的成绩和实战比起来如何？
[attachimg]61448[/attachimg]
第4,5的图
谢谢
我想，实战还是和模考时有差别的.我是26号一战，请问LZ模考的成绩和实战比起来如何？
我两次PP的VERBAL是30，32。。。。做其他最低的也是28，唉。。。。。。
主要是PACE乱了，死在几道逻辑上，时间花太多
哦还有作文
AA：一个叫APX公司的让经理们回家可以通过自己的电脑上公司的终端，结果他们的公司利润增加了。那么推广到其他公司，也会获得成功。
AI：一个人要想获得professional success,就必须牺牲some important aspects of a fulfill personal life
谢谢LZ 不要灰心啊
第5题的图有点看不懂
我两次PP的VERBAL是30，32。。。。做其他最低的也是28，唉。。。。。。
主要是PACE乱了，死在几道逻辑上，时间花太多
请问楼主Prep跟考试的界面是一模一样吗？是不是每次答完题都会弹出对话框进行确认啊？
谢谢LZ 不要灰心啊
第5题的图有点看不懂
7个一样的圆，里面接着一个正六边
请问楼主Prep跟考试的界面是一模一样吗？是不是每次答完题都会弹出对话框进行确认啊？
六边形顶点是外面六个圆的圆心吧 外面的六个圆都是相切的么？貌似不难算
LZ不要郁闷了 这次不行 咱还有下次！
第五题怎么算呀？
In the two decades between 1910 and 1930, over
ten percent to the Black population of the
left the South, where the preponderance of the Black
population had been located, and migrated to northern
(5) states, with the largest number moving, it is claimed,
between 1916 and 1918. It has been frequently assumed,
but not proved, that the majority of the migrants in
what has come to be called the Great Migration came
from rural areas and were motivated by two concurrent
(10) factors: the collapse of the cotton industry following
the boll weevil infestation, which began in 1898, and
increased demand in the North for labor following
the cessation of European immigration caused by the
outbreak of the First World War in 1914. This assump-
(15) tion has led to the conclusion that the migrants’ subse-
quent lack of economic mobility in the North is tied to
rural background, a background that implies unfamil-
iarity with urban living and a lack of industrial skills.
But the question of who actually left the South has
(20) never been rigorously investigated. Although numerous
investigations document an exodus from rural southern
areas to southern cities prior to the Great Migration.
no one has considered whether the same migrants then
moved on to northern cities. In 1910 over 600,000
(25) Black workers, or ten percent of the Black work force,
reported themselves to be engaged in “manufacturing
and mechanical pursuits,” the federal census category
roughly encompassing the entire industrial sector. The
Great Migration could easily have been made up entirely
(30) of this group and their families. It is perhaps surprising
to argue that an employed population could be enticed
to move, but an explanation lies in the labor conditions
then prevalent in the South.
About thirty-five percent of the urban Black popu-
(35) lation in the South was engaged in skilled trades. Some
were from the old artisan class of slavery-blacksmiths.
masons, carpenters-which had had a monopoly of
certain trades, but they were gradually being pushed
out by competition, mechanization, and obsolescence,
(40) The remaining sixty-five percent, more recently urban-
ized, worked in newly developed industries---tobacco.
lumber, coal and iron manufacture, and railroads.
Wages in the South, however, were low, and Black
workers were aware, through labor recruiters and the
(45)Black press, that they could earn more even as unskilled
workers in the North than they could as artisans in the
South. After the boll weevil infestation, urban Black
workers faced competition from the continuing influx
of both Black and White rural workers, who were driven
(50) to undercut the wages formerly paid for industrial jobs.
Thus, a move north would be seen as advantageous
to a group that was already urbanized and steadily
employed, and the easy conclusion tying their subse-
quent economic problems in the North to their rural
background comes into question.
31. The author indicates explicitly that which of the following records has been a source of information in her
investigation?
(A) United States Immigration Service reports from 1914 to 1930
(B) Payrolls of southern manufacturing firms between 1910 and 1930
(C) The volume of cotton exports between 1898 and 1910
(D) The federal census of 1910（D）
(E) Advertisements of labor recruiters appearing in southern newspapers after 1910
32. In the passage, the author anticipates which of the following as a possible objection to her argument?
(A) It is uncertain how many people actually migrated during the Great Migration.
(B) The eventual economic status of the Great Migration migrants has not been adequately traced.
(C) It is not likely that people with steady jobs would have reason to move to another area of the country.
(D) It is not true that the term “manufacturing and mechanical pursuits” actually encompasses the entire industrial sector.
（C）
(E) Of the Black workers living in southern cities, only those in a small number of trades were threatened by obsolescence.
33. According to the passage, which of the following is true of wages in southern cities in 1910?
(A) They were being pushed lower as a result of increased competition.
(B) They had begun t to rise so that southern industry could attract rural workers.
(C) They had increased for skilled workers but decreased for unskilled workers.
(D) They had increased in large southern cities but decreased in small southern cities.
（A）
(E) They had increased in newly developed industries but decreased in the older trades.
34. The author cites each of the following as possible influences in a Black worker’s decision to migrate north in the Great Migration EXCEPT
(A) wage levels in northern cities
(B) labor recruiters
(C) competition from rural workers
(D) voting rights in northern states（D）
(E) the Black press
35. It can be inferred from the passage that the “easy conclusion” mentioned in line 53 is based on which of the following assumptions?
(A) People who migrate from rural areas to large cities usually do so for economic reasons.
(B) Most people who leave rural areas to take jobs in cities return to rural areas as soon as it is financially possible for them to do so.
(C) People with rural backgrounds are less likely to succeed economically in cities than are those with urban backgrounds.
(D) Most people who were once skilled workers are not willing to work as unskilled workers.
（C）
(E) People who migrate from their birthplaces to other regions of country seldom undertake a second migration.
36. The primary purpose of the passage is to
(A) support an alternative to an accepted methodology
(B) present evidence that resolves a contradiction
(C) introduce a recently discovered source of information
(D) challenge a widely accepted explanation（D）
(E) argue that a discarded theory deserves new attention
31.
D is the best answer.
In lines 35-41, the author states that ten percent of the Black workers in the South were employed
in “manufacturing and mechanical pursuits” and then identifies “manufacturing and mechanical
pursuits” as the general federal census category for industrial occupations in 1910. Thus, she
indicates that she used the federal census as a source of information.
32.
C is the best answer. To answer this question, you must first identify the author’s argument. The
author argues that it is possible that Black migrants to the North were living and working in urban
areas of the South rather in rural areas, as researchers had previously assumed. In lines 44-48, the
author states that it may be “surprising” that an employed population would relocate. Thus, the
author anticipates an objection to her argument on the grounds that Black urban workers in the
South would have been unlikely to leave an economically secure existence. She meets that
objection by stating that “an explanation lies in the labor conditions then prevalent in the South”
(lines 46-48), and discusses the low wages that may have motivated Black workers to migrate
north for higher pay.
33.
A is the best answer. The author discusses wages in southern cities in the third paragraph. Lines
68-73 state that an increase in the number of rural workers who migrated to southern cities after
the collapse of the cotton industry led to increased competition for jobs and resulted in wages
being pushed lower.
34.
D is the best answer. This question asks you to identify the possible influences that motivated
Black workers in their decision to migrate north, and then to recognize which of the choices is
NOT mentioned as an influence on Black workers.
This is the only option not mentioned in the passage as an influence that may have motivated
southern Black workers to move north.
35.
C is the best answer. To answer this question, you must first identify the “easy conclusion”
mentioned in lines 77-79, which ties Black migrants’ “subsequent economic problems in the North
to their rural background.” This linkage of rural background to economic difficulty after migration
to the North is first mentioned in lines 20-26. Here, the author points out that researchers have
assumed that Black migrants encountered economic difficulties in northern cities because they
were from rural rather than urban backgrounds, and that rural backgrounds imply “unfamiliarity
with urban living and a lack of industrial skills.” This choice provides an assumption about the
relationship between rural backgrounds and economic difficulty that underlies this conclusion. It
states that people with rural backgrounds are more likely to have economic difficulty in urban
areas than are people with urban backgrounds.
36.
D is the best answer. The first paragraph describes a common assumption about the Great
Migration, that the majority of migrants came from rural areas. It also restates the conclusion that
is based on this assumption, that the subsequent economic difficulties of Black migrants in the
North were a result of their unfamiliarity with urban life. In the second paragraph, the author states
that the “question of who actually left the South” (lines 27-28) has never been adequately
researched. She goes on to argue that Black migrants may actually have been from urban areas
rather than rural areas, and thus that their subsequent economic problems in northern cities were
not caused by their rural background. In making this argument, the author is challenging the
“widely accepted explanation” presented in the first paragraph.
请问楼上这篇问题的答案是什么 谢谢
1. 有50%教法语，有56%教数学，且28%这两项都教，问neither的percentage?
1-(0.5+0.56-0.28)=0.22
2. x/y<0? 1.y>0 2.y/x<0
B
3. n被15除的余数？ 1。N被5除余(数字忘了) 2.N被6除余（也忘了）
4.
5.
6.A机器的效率是B的3/4,A和B一起完成一个东西要6小时,问B单独完成要多久
63/24
楼主 M50 V26 总分有多少？我11.11考 因为我V很差，正在考虑换时间
如果M51 V26能上700的话我就考掉算了
1. 有50%教法语，有56%教数学，且28%这两项都教，问neither的percentage?
1-(0.5+0.56-0.28)=0.22
2. x/y<0? 1.y>0 2.y/x<0
B
3. n被15除的余数？ 1。N被5除余(数字忘了) 2.N被6除余（也忘了）
4.
5.
6.A机器的效率是B的3/4,A和B一起完成一个东西要6小时,问B单独完成要多久
63/24
数学第六题答案有问题吧 应该是21/2 不可能B单独完成的时间比6小时还短哦
In the two decades between 1910 and 1930, over
ten percent to the Black population of the
left the South, where the preponderance of the Black
population had been located, and migrated to northern
(5) states, with the largest number moving, it is claimed,
between 1916 and 1918. It has been frequently assumed,
but not proved, that the majority of the migrants in
what has come to be called the Great Migration came
from rural areas and were motivated by two concurrent
(10) factors: the collapse of the cotton industry following
the boll weevil infestation, which began in 1898, and
increased demand in the North for labor following
the cessation of European immigration caused by the
outbreak of the First World War in 1914. This assump-
(15) tion has led to the conclusion that the migrants’ subse-
quent lack of economic mobility in the North is tied to
rural background, a background that implies unfamil-
iarity with urban living and a lack of industrial skills.
But the question of who actually left the South has
(20) never been rigorously investigated. Although numerous
investigations document an exodus from rural southern
areas to southern cities prior to the Great Migration.
no one has considered whether the same migrants then
moved on to northern cities. In 1910 over 600,000
(25) Black workers, or ten percent of the Black work force,
reported themselves to be engaged in “manufacturing
and mechanical pursuits,” the federal census category
roughly encompassing the entire industrial sector. The
Great Migration could easily have been made up entirely
(30) of this group and their families. It is perhaps surprising
to argue that an employed population could be enticed
to move, but an explanation lies in the labor conditions
then prevalent in the South.
About thirty-five percent of the urban Black popu-
(35) lation in the South was engaged in skilled trades. Some
were from the old artisan class of slavery-blacksmiths.
masons, carpenters-which had had a monopoly of
certain trades, but they were gradually being pushed
out by competition, mechanization, and obsolescence,
(40) The remaining sixty-five percent, more recently urban-
ized, worked in newly developed industries---tobacco.
lumber, coal and iron manufacture, and railroads.
Wages in the South, however, were low, and Black
workers were aware, through labor recruiters and the
(45)Black press, that they could earn more even as unskilled
workers in the North than they could as artisans in the
South. After the boll weevil infestation, urban Black
workers faced competition from the continuing influx
of both Black and White rural workers, who were driven
(50) to undercut the wages formerly paid for industrial jobs.
Thus, a move north would be seen as advantageous
to a group that was already urbanized and steadily
employed, and the easy conclusion tying their subse-
quent economic problems in the North to their rural
background comes into question.
31. The author indicates explicitly that which of the following records has been a source of information in her
investigation?
(A) United States Immigration Service reports from 1914 to 1930
(B) Payrolls of southern manufacturing firms between 1910 and 1930
(C) The volume of cotton exports between 1898 and 1910
(D) The federal census of 1910（D）
(E) Advertisements of labor recruiters appearing in southern newspapers after 1910
32. In the passage, the author anticipates which of the following as a possible objection to her argument?
(A) It is uncertain how many people actually migrated during the Great Migration.
(B) The eventual economic status of the Great Migration migrants has not been adequately traced.
(C) It is not likely that people with steady jobs would have reason to move to another area of the country.
(D) It is not true that the term “manufacturing and mechanical pursuits” actually encompasses the entire industrial sector.
（C）
(E) Of the Black workers living in southern cities, only those in a small number of trades were threatened by obsolescence.
33. According to the passage, which of the following is true of wages in southern cities in 1910?
(A) They were being pushed lower as a result of increased competition.
(B) They had begun t to rise so that southern industry could attract rural workers.
(C) They had increased for skilled workers but decreased for unskilled workers.
(D) They had increased in large southern cities but decreased in small southern cities.
（A）
(E) They had increased in newly developed industries but decreased in the older trades.
34. The author cites each of the following as possible influences in a Black worker’s decision to migrate north in the Great Migration EXCEPT
(A) wage levels in northern cities
(B) labor recruiters
(C) competition from rural workers
(D) voting rights in northern states（D）
(E) the Black press
35. It can be inferred from the passage that the “easy conclusion” mentioned in line 53 is based on which of the following assumptions?
(A) People who migrate from rural areas to large cities usually do so for economic reasons.
(B) Most people who leave rural areas to take jobs in cities return to rural areas as soon as it is financially possible for them to do so.
(C) People with rural backgrounds are less likely to succeed economically in cities than are those with urban backgrounds.
(D) Most people who were once skilled workers are not willing to work as unskilled workers.
（C）
(E) People who migrate from their birthplaces to other regions of country seldom undertake a second migration.
36. The primary purpose of the passage is to
(A) support an alternative to an accepted methodology
(B) present evidence that resolves a contradiction
(C) introduce a recently discovered source of information
(D) challenge a widely accepted explanation（D）
(E) argue that a discarded theory deserves new attention
31.
D is the best answer.
In lines 35-41, the author states that ten percent of the Black workers in the South were employed
in “manufacturing and mechanical pursuits” and then identifies “manufacturing and mechanical
pursuits” as the general federal census category for industrial occupations in 1910. Thus, she
indicates that she used the federal census as a source of information.
32.
C is the best answer. To answer this question, you must first identify the author’s argument. The
author argues that it is possible that Black migrants to the North were living and working in urban
areas of the South rather in rural areas, as researchers had previously assumed. In lines 44-48, the
author states that it may be “surprising” that an employed population would relocate. Thus, the
author anticipates an objection to her argument on the grounds that Black urban workers in the
South would have been unlikely to leave an economically secure existence. She meets that
objection by stating that “an explanation lies in the labor conditions then prevalent in the South”
(lines 46-48), and discusses the low wages that may have motivated Black workers to migrate
north for higher pay.
33.
A is the best answer. The author discusses wages in southern cities in the third paragraph. Lines
68-73 state that an increase in the number of rural workers who migrated to southern cities after
the collapse of the cotton industry led to increased competition for jobs and resulted in wages
being pushed lower.
34.
D is the best answer. This question asks you to identify the possible influences that motivated
Black workers in their decision to migrate north, and then to recognize which of the choices is
NOT mentioned as an influence on Black workers.
This is the only option not mentioned in the passage as an influence that may have motivated
southern Black workers to move north.
35.
C is the best answer. To answer this question, you must first identify the “easy conclusion”
mentioned in lines 77-79, which ties Black migrants’ “subsequent economic problems in the North
to their rural background.” This linkage of rural background to economic difficulty after migration
to the North is first mentioned in lines 20-26. Here, the author points out that researchers have
assumed that Black migrants encountered economic difficulties in northern cities because they
were from rural rather than urban backgrounds, and that rural backgrounds imply “unfamiliarity
with urban living and a lack of industrial skills.” This choice provides an assumption about the
relationship between rural backgrounds and economic difficulty that underlies this conclusion. It
states that people with rural backgrounds are more likely to have economic difficulty in urban
areas than are people with urban backgrounds.
36.
D is the best answer. The first paragraph describes a common assumption about the Great
Migration, that the majority of migrants came from rural areas. It also restates the conclusion that
is based on this assumption, that the subsequent economic difficulties of Black migrants in the
North were a result of their unfamiliarity with urban life. In the second paragraph, the author states
that the “question of who actually left the South” (lines 27-28) has never been adequately
researched. She goes on to argue that Black migrants may actually have been from urban areas
rather than rural areas, and thus that their subsequent economic problems in northern cities were
not caused by their rural background. In making this argument, the author is challenging the
“widely accepted explanation” presented in the first paragraph.
not really...
Great Migration是个很大文化背景,就像中国的文革一样,可以出很多文章
大家别神经过敏咯.呵呵
加油
数学第六题答案有问题吧
谢谢，不要气馁，继续努力！数学第六题答案有问题吧 应该是21/2 不可能B单独完成的时间比6小时还短哦
my bad
答案是21/2
my bad
答案是21/2
agree
my bad
答案是21/2
答案都是整数的.....我记得是7,8,9,10,12
我就选了12....因为10小时是不能完成的
你就想成是6个正三角形（面积你总会求吧）的面积和减去一个圆面积，再减去6个120度角的扇形（相当于是2个圆形）的面积
正三角形的边长就是2个半径相加，楼主的图没画好，应该是中间那个圆还要和左右两个圆相切
不好意思，底子不好，能解释的再详细一些吗？知道了园的半径，那个6个正三角形面积怎么求的呢？谢谢！！！
Math no.6: 21/2没错啊，lz会不会把题目记错了？
no5：把当中那个圆的圆心和上下圆的圆心都连起来，就是左右各一个菱形，这个菱形面积就是2Ö`3R²(打字符太累了，5555）,再减去阴影外面的四个扇形，也就是兀R²，就是阴影面积了，一共是（4Ö`3－2兀）R²
lz来确认一下对不？
那个六边形能通过6个正三角形求吗？
是不是两个三角形加上一个长方形啊，谢谢！
Math no.6: 21/2没错啊，lz会不会把题目记错了？
no5：把当中那个圆的圆心和上下圆的圆心都连起来，就是左右各一个菱形，这个菱形面积就是2Ö`3R²(打字符太累了，5555）,再减去阴影外面的四个扇形，也就是兀R²，就是阴影面积了，一共是（4Ö`3－2兀）R²
lz来确认一下对不？
那第三题的答案是什么啊?E吗?
A机器的效率是B的3/4,A和B一起完成一个东西要6小时,问B单独完成要多久
这道题我的答案是14
那第三题的答案是什么啊?E吗?
我后来算出来的答案也是14.
21/2 is incorrect, IMO.
我后来算出来的答案也是14.
21/2 is incorrect, IMO.
但是你把14带回题目验证 得出的答案是8小时而不是6小时啊
谢谢楼主咯！
（考完不满意和准备考的XDJM都一样受尽煎熬，该死的GMAT......罪过罪过）
不好意思, 误導 le. 因该是21/2. 有"14"答案的，可能跟我一样把
A=3/4B 代入了．．.
有"14"答案的，可能跟我一样把
A=3/4B 代入了．．.
第六题是14
(20日）算错了，同意21/2。
21/2，他告诉你的是效率，所有1/（3/4B+B）=6=〉B的效率为2/21
然后1/B=21/2
时间X效率=总工程量
阴影部分=正六边形面积(公式: 3/2*√3*p2)-6个120度角的扇形的面积(相当于两个圆)-中间一个圆的面积
P=2R 所以 S=3/2*√3*4R2-2πR2-πR2=6√3*R2 -3πR2
好像和前面的不太一样，但解题思路应该是一样的。
阴影部分=正六边形面积(公式: 3/2*√3*p2)-6个120度角的扇形的面积(相当于两个圆)-中间一个圆的面积
P=2R 所以 S=3/2*√3*4R2-2πR2-πR2=6√3*R2 -3πR2
好像和前面的不太一样，但解题思路应该是一样的。
"通货膨胀和经济政策的关系，GWD里有 具体是哪套题的啊，能上传一下吗？谢了！ "
已经post 了, title 是 "I found this JJ article from GWD". 下面看看.
不好意思,这道题我看错了,看成B是A的3/4了
我后来算出来的答案也是14.
21/2 is incorrect, IMO.
同意! A=3/4B --> 1/A +1/B=1/6 ---> 1/(4/3B)+1/B = 1/6 ---> 14
按LZ 说, 答案都是整数, 我想是对的.
你就想成是6个正三角形（面积你总会求吧）的面积和减去一个圆面积，再减去6个120度角的扇形（相当于是2个圆形）的面积
正三角形的边长就是2个半径相加，楼主的图没画好，应该是中间那个圆还要和左右两个圆相切
多边形内角和＝（N-2）*180 N 为多边形的边数
五边形内角和＝3×180＝540
多边形内角和＝（N-2）*180 N 为多边形的边数
五边形内角和＝3×180＝540
好惭愧,都忘光了.同意! A=3/4B --> 1/A +1/B=1/6 ---> 1/(4/3B)+1/B = 1/6 ---> 14
按LZ 说, 答案都是整数, 我想是对的.
我感觉你写的A=3/4B 是设的A和B是工作效率
而你写的1/A+1/B=1/6是设的A和B是工作时间，
第一个是效率，第二个是时间，感觉这么设算出来的结果好像不对
不知道别人怎么看？
"通货膨胀和经济政策的关系，GWD里有 具体是哪套题的啊，能上传一下吗？谢了！ "
已经post 了, title 是 "I found this JJ article from GWD". 下面看看.
沒有看到...
"通货膨胀和经济政策的关系，GWD里有 具体是哪套题的啊，能上传一下吗？谢了！ "
已经post 了, title 是 "I found this JJ article from GWD". 下面看看.
http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=282542&page=1
I found it. Thank you.
我感觉你写的A=3/4B 是设的A和B是工作效率
而你写的1/A+1/B=1/6是设的A和B是工作时间，
第一个是效率，第二个是时间，感觉这么设算出来的结果好像不对
不知道别人怎么看？
他第二个等式列错了吧
可是这道题楼主不是说选项答案中都是整数吗
2/21算出来是A的效率,,应该是1/(3/4A+A）=6,B的效率是3/4A,所以算出B的效率是1/14,单独完成是14小时
不要误导大家了，LZ没有说是整数，文中是A是B的3/4
这题就是2/21，请做错的同学整理一下自己的思路~~~
没有答案，题目不全，只有方法，共你参考：
76. 有个正整数，被7除余1，求它的值。
条件一，被9除余7。
条件二被4除余3。
解法：选E。设所求正整数为X，通项为X=Am+n，根据条件一可得，X=Am+n=7a+1=9b+7，A是7和9的最小公倍数=63，n为X的最小值，即满足7a+1=9b+7的最小的（a，b）值=>7a=9b+6=3(3b+2)。从这个等式来看，a必然是3的倍数，(3b+2)必然是7的倍数，很快可以得出3b+2=14，b=4，a=6。所以X=63m1+43，根据m1的取值不同，X有很多不同值，所以条件一不充分。
同理可求得条件二下的通项为X=28m2+15，同样根据m2不同取值X可能为很多不同的值。条件二不充分。
联立条件一和条件二得：63m1+43=28m2+15 => 63m1=28m2-28 => 9m1=4(m2-1)。其中，m1必然为4的倍数，(m2-1)必然为9的倍数，可得无数组(m1，m2)。条件一＋条件二也不充分。
这里说一个一招搞定的做法：
通项S，形式设为S=Am+B，一个乘法因式加一个常量
系数A必为两小通项因式系数的最小公倍数
常量B应该是两个小通项相等时的最小数，也就是最小值的S
例题：4－JJ78(三月84).ds某数除7余3，除4余2，求值。
解：设通项S=Am+B。由题目可知，必同时满足S=7a+3=4b+2
A同时可被7和4整除，为28（若是S＝6a+3=4b+2，则A＝12）
B为7a+3=4b+2的最小值，为10（a=1.b=2时，S有最小值10）
所以S＝28m＋10
满足这两个条件得出的通项公式，必定同时满足两个小通项。如果不能理解的话，就记住这个方法吧，此类的求通项的问题就能全部，一招搞定啦
Lz不要灰心!
我还没作过GWD呢,就要考试了,来不及了,汗...
有好心人把通货膨胀和经济政策的关系那篇贴出来吗
不要误导大家了，LZ没有说是整数，文中是A是B的3/4
这题就是2/21，请做错的同学整理一下自己的思路~~~
没有答案，题目不全，只有方法，共你参考：
76. 有个正整数，被7除余1，求它的值。
条件一，被9除余7。
条件二被4除余3。
解法：选E。设所求正整数为X，通项为X=Am+n，根据条件一可得，X=Am+n=7a+1=9b+7，A是7和9的最小公倍数=63，n为X的最小值，即满足7a+1=9b+7的最小的（a，b）值=>7a=9b+6=3(3b+2)。从这个等式来看，a必然是3的倍数，(3b+2)必然是7的倍数，很快可以得出3b+2=14，b=4，a=6。所以X=63m1+43，根据m1的取值不同，X有很多不同值，所以条件一不充分。
同理可求得条件二下的通项为X=28m2+15，同样根据m2不同取值X可能为很多不同的值。条件二不充分。
联立条件一和条件二得：63m1+43=28m2+15 => 63m1=28m2-28 => 9m1=4(m2-1)。其中，m1必然为4的倍数，(m2-1)必然为9的倍数，可得无数组(m1，m2)。条件一＋条件二也不充分。
这里说一个一招搞定的做法：
通项S，形式设为S=Am+B，一个乘法因式加一个常量
系数A必为两小通项因式系数的最小公倍数
常量B应该是两个小通项相等时的最小数，也就是最小值的S
例题：4－JJ78(三月84).ds某数除7余3，除4余2，求值。
解：设通项S=Am+B。由题目可知，必同时满足S=7a+3=4b+2
A同时可被7和4整除，为28（若是S＝6a+3=4b+2，则A＝12）
B为7a+3=4b+2的最小值，为10（a=1.b=2时，S有最小值10）
所以S＝28m＋10
满足这两个条件得出的通项公式，必定同时满足两个小通项。如果不能理解的话，就记住这个方法吧，此类的求通项的问题就能全部，一招搞定啦
学到不少！谢谢
和楼上同感
另外，觉得数学好难.....
| 欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |