【二】请教几道数学题! TAOTAO数学里的~

cutewen · 发表于 2010-4-24 20:26:08

1.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

我有点不太懂问题前的那句话到底啥意思..我就直接算的100到300的总和然后除以2 不过貌似等于20100
所以还是问问的大家啦!! 答案是B

2.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

答案是D 我选的C 估摸着我也是题目没懂..

3.What is the median number of employees assigned per project for the projects at Company Z?
(1)25 percent of the projects at Company Z have 4 or more employees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

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.

答案是C。这个题目是这三题中我完完全全没看懂乱选的题目...

排版有点扭曲..请见谅!!! 另 TAOTAO数学是不是就是GWD里的数学哦？？？

cutewen · 发表于 2010-4-24 22:26:56

自己顶 - -

angusco · 发表于 2010-4-24 22:45:03

我也刚开始看数学。。。一些基本数学词汇还是要先看下的

1.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

我有点不太懂问题前的那句话到底啥意思..我就直接算的100到300的总和然后除以2 不过貌似等于20100
所以还是问问的大家啦!! 答案是B

题目告诉你怎么算数列和并让你应用。。。问99到301中偶数和是多少
也就是100，102，。。。300
（100+300）* 101 /2 =20200

2.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

答案是D 我选的C 估摸着我也是题目没懂..

题目定义了一个正整数n"prime-saturated" 的情况为 n所有质因子的乘积小于它的平方根问你下面最小的2位数 prime-saturated integer
从小往大吧。。95=5*19 不对 96=2^5 *3 所以质因数乘机为 2*3 < 根号96 所以就它了

3.What is the median number of employees assigned per project for the projects at Company Z?
(1)25 percent of the projects at Company Z have 4 or more employees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

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.

答案是C。这个题目是这三题中我完完全全没看懂乱选的题目...

题目问每个项目分配多少员工的中卫数是多少
1. 25%项目分配大于等于4个员工每项目
2. 35%项目分配小于等于2个员工每项目

也就是说25%和35%是在两头的（从小到大排列）所以一起得出中位数为3

cutewen · 发表于 2010-4-25 17:43:15

感谢！我再算算喔。不过第二题里的GREATEST应该是最大不是最小啦！可能你是笔误还是咋的~~谢谢！

【二】请教几道数学题! TAOTAO数学里的~

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