[讨论]2005年11月数学机经讨论稿第十稿(381-430)题（11.26更新）

advantage

...5 10 15...和 ...4 16 64...或是和 ...4 8 12 ...这样就是两种可能呢

carolhide

以下是引用momoyu在2005-11-26 21:41:00的发言：

410 我觉得是E啊,不知道这8个数之间是怎样的倍数关系,如果每个倍数差很远SD就很大.

416)      There are 20 students, taking Spanish, German and French. No one taking more than one course, 12 take G, what is the ratio of S to F? (1). ratio of G to S is 1:3 (2). number of S is XX(actual number) >>

KEY：D>>

思路：因一个学生只选一个课，因此学生数与选课数相等。

此题不理解,是说总共20个学生吗?这样的话G to S = 1:3, then S> 20, not reasonable.

if don't know the total number of students, how to get the ratio of S to F from G=12, S=36? or S=xx.

Seems I have some misunderstanding here.

28号要考,望解疑

这题我没有考虑到数据会超出范围，一般ETS不太会这样地方出题吧？可能是作者写的时候题目有点记错了。

carolhide

以下是引用advantage在2005-11-26 22:34:00的发言：


我还是坚持e,因为可以每个数之间的间距没有明确说明吧...

恩，现在在回想，确实无法确定。

[此贴子已经被作者于2005-11-26 23:02:04编辑过]

springappleleaf

422)      A person put X dollars in a bank, withdraws S and deposit D and left P, is P > X?—1) D – S = 9, 2) X-S = (a number)

KEY：E

I think the answer should be A.  A is the diff between the deposited amount and withdrawn amount.  Once we know the diff, we will be able to see what direction it will affect the ending balance.

carolhide

以下是引用springappleleaf在2005-11-26 23:00:00的发言：

422)      A person put X dollars in a bank, withdraws S and deposit D and left P, is P > X?—1) D – S = 9, 2) X-S = (a number)

KEY：E

I think the answer should be A.  A is the diff between the deposited amount and withdrawn amount.  Once we know the diff, we will be able to see what direction it will affect the ending balance.

你能否把D，P，S的关系解释一下么？

springappleleaf

416)      There are 20 students, taking Spanish, German and French. No one taking more than one course, 12 take G, what is the ratio of S to F? (1). ratio of G to S is 1:3 (2). number of S is XX(actual number)

KEY：D

It seems that this question has problem: 12 take G and 1) ratio of G to S is 1:3, then S should be 36.  But total student is 20?

springappleleaf

以下是引用springappleleaf在2005-11-26 23:00:00的发言：

422)      A person put X dollars in a bank, withdraws S and deposit D and left P, is P > X?—1) D – S = 9, 2) X-S = (a number)

KEY：E

I think the answer should be A.  A is the diff between the deposited amount and withdrawn amount.  Once we know the diff, we will be able to see what direction it will affect the ending balance.

你能否把D，P，S的关系解释一下么？

X-S+D=P, in other words, D-S = P-X

[此贴子已经被作者于2005-11-27 0:14:35编辑过]

redyoyo

That is so great, girl, thank you very very much.

springappleleaf

carolhide, thank you for the hard and great work this month!

I know it is a little pushing.  But when do you plan to continue the discussion for the questions after #430?

I am right now review all the questions in this discussion thread. After I finish it, do you mind my posting the answers for the rest of questions?

springappleleaf

411.  有一陀數列的偶數between 13 and 33 (沒有提到inclusive or exclusive)，問下面哪個對，I. 其中7個數是3的倍數。II. 忘了。III. 也忘了。(其實這題很簡單，只要是人都會算，可是我算錯而且是現在才知道錯，關鍵是題目只講到介於13到33的偶數，我在選答案的時候忘記考慮這點了，所以大家自己眼睛張大一點喔！)

I. 其中7個數是3的倍數  This is not correct