prep上几道题~~请教下大家

theone30

第一题:Before being simplified, the instructions fo computing income tax in Country R were to add 2 percent of one`s annual income to the average of 100 units of Country R`s currency and 1 percent of one`s annual income.Which of the following represents the simplified formula for computing the income tax,in Country R`s currency,for a person in that country whose annual income is I?

A:50+I/200      B:50+3I/100       C:50+I/40         D:100+I/50         E:100+3I/100

这题是题目什么意思根本没看懂...

第二题:What is the geatest common divisor of positive integers M and N?
             (1) M is a prime number
             (2)2N=7m

主题估计是概念不清吧...这题应该是选C



第三题:A committee of three people is to be choosen from four married couples.What is the number of different committees that can be chosen if two people who are married to each other cannot both serve on the committeee?
       A 16  B 24  C 26 D 30 E 32

答案我忘了...这个排列问题我一直搞不清楚..是8C3-(4C1)*(6C1)伐

切尔西

第二题答案应该是E吧
C肯定不对了，M是质数，然后2N=7M,这样就得出N是不是整数，与题干不符

alohawilliam

第二题答案应该是E吧
C肯定不对了，M是质数，然后2N=7M,这样就得出N是不是整数，与题干不符

-- by 会员 切尔西 (2009/11/12 16:49:00)

是C
2N肯定是偶数，那么7m也要是偶数，所以M是偶数
结合1的话，M只能是2
确定

sayysong

#1 C
add 2 percent of one`s annual income to the average of 100 units of Country R`s currency and 1 percent of one`s annual income.Which of the following represents the simplified formula for computing the income tax
2%的年收 + （100单位的R国货币 + 1%的年收）的平均值 --> 2%I + （100+1%I） / 2 --> C

#2 C
赞同 alohawilliam 的说法

#3 A
8个人四对夫妇，从中选3个组成一个委员会，夫妻两个不能同时入会，共多少种组法。
第一对夫妻中任选一个有2种选法，第二对夫妻中任选一个也有2种选法，剩下的一个人在两对夫妻4个人当中随便选，所以是4种选法。2 * 2 * 4 = 16

对不对啊？大家指正～