弱弱地请教几道有疑问的数学题

moonsini · 发表于 2010-5-18 12:13:51

弱弱地请教几道有疑问的数学题：
（1）Joanna bought only $0.15 stamps and $0.29 stamps.How many $0.15 stamps did she buy?
(1)She bought $4.40 worth of stamps.
(2)She bought an equal number of $0.15 stamps and $0.29 stamps.
答案是D，我选的是C
（2）What is the median number of emplyees assigned per project for the projects at Company Z?
(1)25 percent of the projects at Company Z have 4 or more emplyees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or more emplyees assigned to each project.
答案是C，我选的是E
(3)The sides of a square region,measured to the nearest centimeters,are 6 centimeters long.The least possible value of the actual area of the square region is
A 36.00sq cm
B 35.00sq cm
C 33.75sq cm
D 30.25sq cm
E 25.00sq cm
不知道怎么做？
（4）What is the remainder when the positive integer n is divided by the positive integer k,where k>1?
(1) n=(k+1)^3
(2) k=5
答案是A，我选的是C
请各位NN解答，谢谢啦~

neckie · 发表于 2010-5-18 12:31:04

楼主第一题答案当真选D吗？条件二怎么也推不出结论啊不过条件一单独倒是可以因为邮票张数要是整数才行总值为4.4时只有唯一解

pengmengzhu · 发表于 2010-5-18 12:32:54

1.（1）440=15x+29y，xy是整数，只能x=10,y=10
(2)不充分
我觉得选A…… 请拍砖

3.四舍五入之后为6。则原数大于等于5.5，面积大于等于30.25

4.n=k^3+3k^2+3k+1=k(K^2+3K+3)+1,余数是1。

能力有限，希望可以有略微帮助

neckie · 发表于 2010-5-18 12:36:59

第二题题目也有问题吧哎不知道是不是我没想明白
第三题正方形边长为6 但是这个6是近似到个位的近似值也就是说边长是5.5~6.4的某个值题目问最小面积那就是边长最小取5.5 选30.25那个

弱弱地请教几道有疑问的数学题

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