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GWD9数学~~有一些题目不明白的数学~求助~

GWD9数学~~有一些题目不明白的数学~求助~

Q2:
Guy’s net income equals his gross income minus his deductions.  By what percent did Guy’s net income change on January 1, **, when both his gross income and his deductions increased?
(1)          Guy’s gross income increased by 4 percent on January 1, **.
(2)          Guy’s deductions increased by 15 percent on January 1, **.不知道这两个是怎么推导出来的,不晓得是不是对题目有理解有问题
       
E. Statements (1) and (2) TOGETHER are NOT sufficient.

Q7:题目不明白
A company has assigned a distinct 3-digit code number to each of its 330 employees.  Each code number was formed from the digits

2, 3, 4, 5, 6, 7, 8, 9

and no digit appears more than once in any one code number.  How many unassigned code numbers are there?

A.        6

Q20:完全不会~题目不清楚也不会做

        Favorable        Unfavorable        Not Sure
Candidate M        40        20        40
Candidate N        30        35        35

The table above shows the results of a survey of 100 voters each responded “favorable” or “unfavorable” or “not sure” when asked about their impressions of candidate M and of candidate N.  What was the number of voters who responded “favorable” for both candidates?
(1)        The number of voters who did not respond “favorable” for either candidate was 40.
(2)          The number of voters who responded “unfavorable” for both candidates was 10.
       
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Q23:
When tossed, a certain coin has equal probability of landing on either side.  If the coin is tossed 3 times, what is the probability that it will land on the same side each time?
为什么不选A呢?

A. 1/8         
B.1/4 是答案         

Q25:题目也不是很理解~
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be

E.        14

Q26:不会~感觉题目就没有理解~
In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero?
(1)          16x is an integer.
(2)          8x is an integer.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

Q29: ??为什么不选E
For any integer k greater than 1, the symbol k* denotes the product of all the fractions of the form  , where t is an integer between 1 and k, inclusive.  What is the value of  ?

B. 4/5         
E.1/5         

Q34:
What is the value of the integer n?
(1)          n(n + 2) = 15 为什么不行?
(2)          (n + 2)n = 125
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

题目多了点~希望大家能帮助一下~~英语和数学的底子真是不行~嘿嘿~谢谢大家了~
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Q7:题目不明白
A company has assigned a distinct 3-digit code number to each of its 330 employees.  Each code number was formed from the digits

2, 3, 4, 5, 6, 7, 8, 9

and no digit appears more than once in any one code number.  How many unassigned code numbers are there?

A.        6

就是说,用2 3 4 5 6 7 8 9这8个数字,组成无重复数字的3位数。总共有8*7*6=336种情况。
员工有330人。所以有6个是用不上的。
over~。。。

TOP

Q20:完全不会~题目不清楚也不会做

        Favorable        Unfavorable        Not Sure
Candidate M        40        20        40
Candidate N        30        35        35

The table above shows the results of a survey of 100 voters each responded “favorable” or “unfavorable” or “not sure” when asked about their impressions of candidate M and of candidate N.  What was the number of voters who responded “favorable” for both candidates?
(1)        The number of voters who did not respond “favorable” for either candidate was 40.
(2)          The number of voters who responded “unfavorable” for both candidates was 10

题目意思是,M,N两个人竞选嘛,调查了100个人,问他们对这两个人的意见,支持,不支持,或者,不清楚。
表格里写的就是这些东西。
问有多少人同时支持两个人。
(1)支持M或者支持N的人有40个。但是支持M的人已经是40个了。所以说明支持M的40个人里面有30个是支持N的。
于是同时支持两人的就是30人。
(2)这个明显不行。。。。只说了不支持的。但支持的和不确定的这两个因素都是变动的。。。

TOP

Q23:
When tossed, a certain coin has equal probability of landing on either side.  If the coin is tossed 3 times, what is the probability that it will land on the same side each time?
为什么不选A呢?

这个。。。明显啊。。。3次都是正面的概论是1/2*1/2*1/2=1/8.3次都是反面的概率也是一样啊。

所以3次都一样的就是两个1/8了嘛。。。

over~...

TOP

Q25:题目也不是很理解~
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be

E.        14

就是说,要让y*3150,是一个整数的平方。问y的最小值。
把3150分解了,就是2*7*3*3*5*5
要是平方项的话就必须再乘以2和7.
所以y就是14.

over~...

TOP

Q26:不会~感觉题目就没有理解~
In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero?
(1)          16x is an integer.
(2)          8x is an integer.

就是x嘛它就是一个0和1之间的小数!!问:它的十分位的那个数是不是非零。
(1)16x是整数。那么x最小也是1/16。也可能是类似1/2,1/4之类的。。。但是1/16是0.0625,十分位是0。像1/2这种是0.5,十分位非零。所以不行。
(2)同理。。。。。。。。。。。。。。
     最小是1/8,也就是0.125.十分位已经非零了。所以也不会有零的情况。
     于是这个是可以的。

再于是。选B

over~...
1

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Q29。。

这个。。看了好久没看懂。。。是不是题目没全啊?。。。无能为力了诶。。

TOP

Q34:
What is the value of the integer n?
(1)          n(n + 2) = 15 为什么不行?
(2)          (n + 2)n = 125

首先。。。特殊疑问句要求有唯一!!确定的答案。
所以(1)有两个答案。不行。

over~...
1

评分人数

TOP

20道题 思路

关于第20道题,我想讲讲自己的思路
在条件(1)        The number of voters who did not respond “favorable” for either candidate was 40.
下,可以得出支持M或支持N或者2者都支持的有60.假设既两者都支持的人数是X。then
40-x+30-x=60,then x=5

题目应该考的是组合

TOP

关于第20道题,我想讲讲自己的思路
在条件(1)        The number of voters who did not respond “favorable” for either candidate was 40.
下,可以得出支持M或支持N或者2者都支持的有60.假设既两者都支持的人数是X。then
40-x+30-x=60,then x=5


我觉得这个思路是对的,但是似乎算法上有问题啊,我认为如果画圆的话,是40和30的并集减去他们的交集再加上那几个要么不同意要么没意见的40人。

即40+30-x+40=100,x=10,我数学很差的。。。有没有人检查下这个对不对。。。

TOP

应该是10 楼上的“40-x+30-x=60”应该改成40+30-x=60

TOP

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GWD9数学~~有一些题目不明白的数学~求助~

GWD9数学~~有一些题目不明白的数学~求助~

Q2:
Guy’s net income equals his gross income minus his deductions.  By what percent did Guy’s net income change on January 1, **, when both his gross income and his deductions increased?
(1)          Guy’s gross income increased by 4 percent on January 1, **.
(2)          Guy’s deductions increased by 15 percent on January 1, **.不知道这两个是怎么推导出来的,不晓得是不是对题目有理解有问题
       
E. Statements (1) and (2) TOGETHER are NOT sufficient.

Q7:题目不明白
A company has assigned a distinct 3-digit code number to each of its 330 employees.  Each code number was formed from the digits

2, 3, 4, 5, 6, 7, 8, 9

and no digit appears more than once in any one code number.  How many unassigned code numbers are there?

A.        6

Q20:完全不会~题目不清楚也不会做

        Favorable        Unfavorable        Not Sure
Candidate M        40        20        40
Candidate N        30        35        35

The table above shows the results of a survey of 100 voters each responded “favorable” or “unfavorable” or “not sure” when asked about their impressions of candidate M and of candidate N.  What was the number of voters who responded “favorable” for both candidates?
(1)        The number of voters who did not respond “favorable” for either candidate was 40.
(2)          The number of voters who responded “unfavorable” for both candidates was 10.
       
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Q23:
When tossed, a certain coin has equal probability of landing on either side.  If the coin is tossed 3 times, what is the probability that it will land on the same side each time?
为什么不选A呢?

A. 1/8         
B.1/4 是答案         

Q25:题目也不是很理解~
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be

E.        14

Q26:不会~感觉题目就没有理解~
In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero?
(1)          16x is an integer.
(2)          8x is an integer.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

Q29: ??为什么不选E
For any integer k greater than 1, the symbol k* denotes the product of all the fractions of the form  , where t is an integer between 1 and k, inclusive.  What is the value of  ?

B. 4/5         
E.1/5         

Q34:
What is the value of the integer n?
(1)          n(n + 2) = 15 为什么不行?
(2)          (n + 2)n = 125
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

题目多了点~希望大家能帮助一下~~英语和数学的底子真是不行~嘿嘿~谢谢大家了~
相关帖子

提示: 作者被禁止或删除 内容自动屏蔽

TOP

Q7:题目不明白
A company has assigned a distinct 3-digit code number to each of its 330 employees.  Each code number was formed from the digits

2, 3, 4, 5, 6, 7, 8, 9

and no digit appears more than once in any one code number.  How many unassigned code numbers are there?

A.        6

就是说,用2 3 4 5 6 7 8 9这8个数字,组成无重复数字的3位数。总共有8*7*6=336种情况。
员工有330人。所以有6个是用不上的。
over~。。。

TOP

Q20:完全不会~题目不清楚也不会做

        Favorable        Unfavorable        Not Sure
Candidate M        40        20        40
Candidate N        30        35        35

The table above shows the results of a survey of 100 voters each responded “favorable” or “unfavorable” or “not sure” when asked about their impressions of candidate M and of candidate N.  What was the number of voters who responded “favorable” for both candidates?
(1)        The number of voters who did not respond “favorable” for either candidate was 40.
(2)          The number of voters who responded “unfavorable” for both candidates was 10

题目意思是,M,N两个人竞选嘛,调查了100个人,问他们对这两个人的意见,支持,不支持,或者,不清楚。
表格里写的就是这些东西。
问有多少人同时支持两个人。
(1)支持M或者支持N的人有40个。但是支持M的人已经是40个了。所以说明支持M的40个人里面有30个是支持N的。
于是同时支持两人的就是30人。
(2)这个明显不行。。。。只说了不支持的。但支持的和不确定的这两个因素都是变动的。。。

TOP

Q23:
When tossed, a certain coin has equal probability of landing on either side.  If the coin is tossed 3 times, what is the probability that it will land on the same side each time?
为什么不选A呢?

这个。。。明显啊。。。3次都是正面的概论是1/2*1/2*1/2=1/8.3次都是反面的概率也是一样啊。

所以3次都一样的就是两个1/8了嘛。。。

over~...

TOP

Q25:题目也不是很理解~
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be

E.        14

就是说,要让y*3150,是一个整数的平方。问y的最小值。
把3150分解了,就是2*7*3*3*5*5
要是平方项的话就必须再乘以2和7.
所以y就是14.

over~...

TOP

Q26:不会~感觉题目就没有理解~
In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero?
(1)          16x is an integer.
(2)          8x is an integer.

就是x嘛它就是一个0和1之间的小数!!问:它的十分位的那个数是不是非零。
(1)16x是整数。那么x最小也是1/16。也可能是类似1/2,1/4之类的。。。但是1/16是0.0625,十分位是0。像1/2这种是0.5,十分位非零。所以不行。
(2)同理。。。。。。。。。。。。。。
     最小是1/8,也就是0.125.十分位已经非零了。所以也不会有零的情况。
     于是这个是可以的。

再于是。选B

over~...
1

评分人数

TOP

Q29。。

这个。。看了好久没看懂。。。是不是题目没全啊?。。。无能为力了诶。。

TOP

Q34:
What is the value of the integer n?
(1)          n(n + 2) = 15 为什么不行?
(2)          (n + 2)n = 125

首先。。。特殊疑问句要求有唯一!!确定的答案。
所以(1)有两个答案。不行。

over~...
1

评分人数

TOP

20道题 思路

关于第20道题,我想讲讲自己的思路
在条件(1)        The number of voters who did not respond “favorable” for either candidate was 40.
下,可以得出支持M或支持N或者2者都支持的有60.假设既两者都支持的人数是X。then
40-x+30-x=60,then x=5

题目应该考的是组合

TOP

关于第20道题,我想讲讲自己的思路
在条件(1)        The number of voters who did not respond “favorable” for either candidate was 40.
下,可以得出支持M或支持N或者2者都支持的有60.假设既两者都支持的人数是X。then
40-x+30-x=60,then x=5


我觉得这个思路是对的,但是似乎算法上有问题啊,我认为如果画圆的话,是40和30的并集减去他们的交集再加上那几个要么不同意要么没意见的40人。

即40+30-x+40=100,x=10,我数学很差的。。。有没有人检查下这个对不对。。。

TOP

应该是10 楼上的“40-x+30-x=60”应该改成40+30-x=60

TOP

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