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标题: 问大家几道GWD的数学题谢谢大家 [打印本页]

作者: miachw901304 时间: 2010-3-10 07:21 标题: 问大家几道GWD的数学题谢谢大家

如题几道GWD数学题 1楼2道

GWD1 (18)

For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2. what is the sum all of the even integers between 99 and 301?

A 10100

B 20200

C 22650

D 40200

E 45150 答案 B

GWD2 (18)

On a certain transatlantic crossing, 20percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship. If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?

A 33 1/3%

B 40%

C 50%

D 60%

E 66 2/3% 答案 C

GWD3 (14)

How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 22 yards? (1mile=1160 yards)

A 8

B 9

C 10

D 11

E 12 答案 C 这道题算了好多次为什么都是1.5？

GWD5 (19)

In a survey of 200 college graduates, 30 percent said they had received student loans during their college careers, and 40 percent said they had received scholarships. What percent of those surveyed said that they had received neither student loans nor scholarships during their college careers?

(1) 25 percent of those surveyed said that they had received scholarship but no loans

(2) 50 percent of those surveyed who said that they had received loans said that they had received scholarships

答案 D 一点也算不出来

作者: bigpig 时间: 2010-3-10 15:15

GWD5-19
200人被调查。
其中60人获得助学贷款，80人获得奖学金。
条件一说50个人获得了奖学金但是没有助学贷款。那就是说有80-50=30个人既有奖学金又有助学贷款。
那么既没助学贷款又没奖学金的人就是200-60-80+30=90人。

条件二说在有助学贷款的人中，50%的人有奖学金，那就是60*50%=30人既有奖学金又有助学贷款。
那么既没助学贷款又没奖学金的人就是200-60-80+30=90人。

如果还是有点模糊，楼主可以画个维恩图看看。就一目了然了。

作者: besttys 时间: 2010-3-10 20:52

GWD1 (18)

For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2. what is the sum all of the even integers between 99 and 301?

A 10100

B 20200

C 22650

D 40200

E 45150 答案 B
这题题目问的是偶数项，所以把他堪称是首相为100末项是300，公差为2的等差数列求和就可以啦

作者: miachw901304 时间: 2010-3-11 07:00

我好像理解了题的意思了谢谢

但是为什么用等差数列我总是算的不对呢

Sn=na1+n(n-1)d/2 这个不是等差数列公式么

na1=100

d=2

n=100

得数差的好远谢谢指点

作者: myice 时间: 2010-3-11 17:38

GWD3 (14)

How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 22 yards? (1mile=1160 yards)

A 8

B 9

C 10

D 11

E 12 答案 C 这道题算了好多次为什么都是1.5？

1mile=1760 yards

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