大家一起来讨论讨论GWD1数学若干问题～～

莲宝 · 发表于 2010-5-21 23:02:30

Q4:
If n is the product of the integers from1 to 20 inclusive, what is the greatest integer k for which 2k is a factor of n?

10
12
15
18
20
貌似题目都没怎么看懂。。。
Q9:
A gardener is going to plant 2 red rosebushes and 2 white rosebushes. If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probability that the 2 rosebushes in the middle of the row will be the red rosebushes?

1/12
1/6
1/5
1/3
1/2

Q20:
If x > 0, then 1/[√(2x)+√x] =

1/√(3x)
1/[2√(2x)]
1/(x√2)
(√2-1)/√x
(1+√2)/√x
晕了，2V(2X)和2V2X有什么不同吗

Q29:
June 25, 1982, fell on a Friday. On which day of the week did June 25, 1987, fall? (Note: 1984 was a leap year.)

Sunday
Monday
Tuesday
Wednesday
Thursday
最讨厌时间的题目，不知道如何下手

mapleaf · 发表于 2010-5-21 23:22:22

你是做的纸质版的？印刷有错误吧第一题是2^k

mapleaf · 发表于 2010-5-21 23:34:05

第二题那是根号不是V。。。

mapleaf · 发表于 2010-5-21 23:43:01

第三题我说个笨方法但是比较清晰，7天是一个星期如果第n天是Monday 那么第n+7天也是Monday 一年有365天，=7*52+1 52个周期多一天，这也就是说同样的 June 25 ，明年的星期数要比今年向后顺延(这么说不准确，领会精神)一个，如果1982年它是个周五，那么1983年他就是周六，如果是leap year (366天) 就会是52个周期零2天，它的星期数就要向后顺延两个，这样到1987年一共过了52*5个周期零6天，推算一下就是周四啦

莲宝 · 发表于 2010-5-22 11:56:02

2^k ？可以详细说明一下吗？
我做的是CD下的WORD版

莲宝 · 发表于 2010-5-22 11:57:34

求助求助啊～～
都说GWD数学简单，为什么俺会错那么多啊

mapleaf · 发表于 2010-5-22 20:16:48

就是2的k次方啊，就是K最大能取几同时使得2^k是n的因子就是问n里面有多少个2。。

lindaaniu · 发表于 2010-5-23 17:21:49

俺也有问题，贴出来帮我解答
Q10:
A set of numbers has the property that for any number t in the set, t + 2 is in the set. If –1 is in the set, which of the following must also be in the set?

I.   -3
II.   1
III.   5

A.   I only
B.   II only
C.   I and II only
D.   II and III only
E.   I, II, and III
Q19:
A total of $60,000 was invested for one year. But of this amount earned simple annual interest at the rate of x percent per year, and the rest earned simple annual interest at the rate of y percent per year. If the total interest earned by the $60,000 for that year was $4,080, what is the value of x?
(1)    x = (3/4) y
(2)   The ratio of the amount that earned interest at the rate of x percent per year to the amount that earned interest at the rate of y percent per year was 3 to 2.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Q25:
A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row. The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her. How many such arrangements of the 6 people are possible?

A.   5
B.   6
C.   9
D.   24
E.   36
Q31:
A positive integer n is said to be “prime-saturated” if the product of all the different positive prime factors of n is less than the square root of n. What is the greatest two-digit prime-saturated integer?

A.   99
B.   98
C.   97
D.   96
E.   95

Q26:
Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y. At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?

A.   4
B.   6
C.   8
D.   10
E.   12
Q28:
For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2. What is the sum of all the even integers between 99 and 301?

A.   10,100
B.   20,200
C.   22,650
D.   40,200
E.   45,150

最后两个，我算出来的分别是16,20100。。。。

大家一起来讨论讨论GWD1数学若干问题～～

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