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一题修正

如果s(x)表示x的各质因子之和,例如120=2^3*3^1*5^1,那么s(120)=3+1+1=5,如果s(m)=4,s(n)=12,那么s(mn)=? 我选16
现在清楚了
同意!



[em06]  [em27]  [em06]  [em27]  [em06]

[此贴子已经被lisaislisa于2002-12-21 19:03:30编辑过]

Concentrated and Diligent

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这几天就看你忙呼了,我代表下礼拜的XDJM感谢你了。。。。。。。。。。。。。

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有几个问题想和大家讨论:

1) x^2+bx+c=(x+d)^2, bcd都是常数,c=?
1)d=3
2)忘了,但肯定肯定能求出c
-------------------------------
B
问题:答案是D吧?

2)一堆书不到50本.如果7本一摞,剩下1本;一共有多少书?
1)如果5个一摞,剩下3本
2)如果4本一摞,剩下3本
A 可以确定有43本,B 可能有15本或者43本
问题:答案是C吧,1)8,43都可以

3)there are 10 ball in a bag,including 1 green ball and 1 yellow ball, draw 3 ball from bag with no replacement, ask the possibilities that 3 ball includes green ball but not includes yellow ball. ans: C82/C103= 7/30
3。有十个球,一个绿,一个蓝,依次取三个球不放回,求第一个是绿,其它二个不是蓝的概率(7/30;1/2;2/5;还有什么不记得了)
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Y.T. (C2,9-C1,9*C1,8)/C3,10=9/30
(C2,9-C1,9*C1,8)这是有一个绿的情况下不取蓝的
作者是同时考虑不包括两者的情况,更好, 就是不一定想的到
问题:中英文表达的应为两道不同题,
         英文题:(C1.1*C2.8)/C3.10
         中文题:(1/C1.10)(C2.8/C2.9)

4)DS. Farmers 种 C and S. every C costs $500 per acre, every S costs $100 per acre, 问种C cost how much in total:
A. total cost for C and S is 34100.
B. farmer has 100 acre C
My answer: C
问题:如果题目没写错,B是答案

5)73.DS. 3^(4n+2)次方+m 除以10,余数是多少?
A. 给出4n+2的数值(忘了是多少)
B. M = 1
ans. E
问题:答案是B吧,3^4n个位数是1呀,

6)五个字母 D I G I T ,可以组成一个string,如 DIGIT.两个II不相临,可以组成多少string?
36
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Y.T. P5-P3*2=108
问题:答案是否是P5/5-P4/4

lisaislisa:真得好感谢你,下周考,我正着急没有JJ。
[em26][em26]

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非常感谢!

希望大家加入到我们的队伍中来
It is not only a test! It is Beyond GMAT!
Robert Zhou
http://weibo.com/irobert

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Redli, I totally agree to your answers for questions 1,2,5.
6 should be 36. P55/2-P44

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to redli:
4)
问种C cost how much 'in total:'
so only B is not sufficient

sorry for my carelessness ...:p and thank you for your patient check
I took for granted some answers from the JJ-maker

good luck for your coming test ^^
Concentrated and Diligent

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69)某部门中男性有50%大于35岁,女性有40%大于35岁,部门人员一共有45%大于35岁,问女性占总人数的比例(数字记得不清楚了,但是意思不会错)
In one company,50% of male employees are at least 35 years old, and 40% of female employees are at least 35 years old. There is 42% of the employees are at least 35 years old. Ask the proportion of female workers in the company.

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Y.T. 20%
Concentrated and Diligent

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thank piaoxue,lisaislisa
第6题piaoxue是对的,TWO I,所以要除2
我又粗心了,好在不是考试,HU,[em04],先擦把汗吧!

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69)某部门中男性有50%大于35岁,女性有40%大于35岁,部门人员一共有45%大于35岁,问女性占总人数的比例(数字记得不清楚了,但是意思不会错)
In one company,50% of male employees are at least 35 years old, and 40% of female employees are at least 35 years old. There is 42% of the employees are at least 35 years old. Ask the proportion of female workers in the company.

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Y.T. 20%
问题:这题我咋算了个反答案?
0.5M+0.4F=0.42(M+F),推出M=(1/4)F,得出F/(M+F)=0.8

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80% is right.

另有几题不懂,请解答:
8. A(k)=(-1)^(k+1)*(1/2^k), k=1, 2, …10, sum is between
----1/4—1/2

怎么算出这个RANGE
34.DS: x+y=?
(1)2^x+8^y=256 (2)3^2x+9^y=81
My Ans: B
该如何分解
37
------(-2)------(-1)--------(0)---------(1)--------(2)
A B C D E

a.b.c,d,e are the number within the range, what is the biggest sum in absolute values? a)a+b b) b+c c) c+d d) d+e e) e
Answer: (a+b)

D+E, 为何不对?

48、一公司有员工255人,问任选一个女员工有大学文凭的概率是否大于1/2?
A、没有大学文凭的有130人。 B、男员工有125人。

我选A.

45、x大于y?a、 x-y大于0;b、x-1大于y

我选D

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