some jijing maths problems???/

2003-01-30 14:55:28

Who can help me these jijing problems. I will take the exam tomorrow! Thanks very very much.
IRIS

16.1. n children can be seated in one table with 3 and each other table with 4; or one table with three and each other table with 5. Ask if each other table seated with 6,
and the left for the one table is less than 5, how many is it?Given n is between 10 and 40, exclusively.
【确认】5
I don’t understand what the problem mean?

37.DS:温度计题，有图，温度计上有4点好像是w, s, r, v(依次从下到上)，ws间2个刻度，sr间2个刻度，rv间1个刻度，s=? 1)w+r=0 2)r+v=5 （2次）
【确认】D 由1)得s=0, 由2)r+v=5得r=2,v=3可得s

my answer is A. If one scale means 5,for example r=5, v=o, then s=-10.

50. dgiti, 五个字母可以排列成多少个不同的word，要求i，i 两个字母中间至少要有一个其他字母隔开。
【确认】p5,5-2p4,4=72

my answer is 6*p3,3=36

54.M数列从4，6，8，10，12，14，16，18，20，22中取8个，求标准方差与原数列相同否？ (2次）
A M 的mean 与原数列相等
B22不在M中
【确认】D 注意如果是问标准方差是多少,则选C
Need much calculation?
62. 1973 june 25是friday, 告诉了其中某年是润年.问1979年 june
25 是星期几?
【讨论】星期五,(具体年份可能不对
What’s 润年 mean? Every 4 year after the first 润年? And 366 days of a润年?

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