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标题: [求助]OG11数学4.5 [打印本页]

作者: 游魂 时间: 2006-1-17 07:36 标题: [求助]OG11数学4.5

54.

A B C D E F

City A

City B

City C

City D

City E

City F

In the table above, what’s the least number of table entries that are needed to show the mileage between each city and each of the other five cities?

A) 15

B) 1

C) 5

D) 0

E) 6

169.If n is a positive integer and n²is divisible by 72, then the largest positive integer that must divide n is

A) 6

B) 12

C) 24

D) 36

E) 48

作者: linlin2008 时间: 2006-1-18 07:49

169. 72=2*2*3*3*2 so least n^2=2*2*3*3*2*2=144 n=12, then the largest positive integer that must divide n is 12. answer: B am i right?

54, 不好意思刚才没看清楚题目，答案应当是（6*6-6）/2=15，看过地图没有，地图上经常会有主要城市间的距离表，是一样的东西。或者用排列组合作（6个里任选两个）6*5/2=15

作者: 游魂 时间: 2006-1-21 13:40

many thanks !!!

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