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标题: 求一道数学,多谢大家! [打印本页]

作者: 谷雨书    时间: 2010-7-4 19:18
标题: 求一道数学,多谢大家!
If n is the product of the integers from 1 to 20 inclusive, what is the greatest integer k for  which 2*k(2的K次幂,不会打请见谅解) is a factor of n?
A,10
B,12
C,15
D,18
E,20
作者: jackraywen    时间: 2010-7-4 19:49
2,4,6,8,10,12,14,16,18,20数一下一共含有多少个2
作者: 谷雨书    时间: 2010-7-4 20:10
多谢楼上的同学,还有一道请教一下哈
A circular mat with diameter 20 inches is placed on a square tabletop, each of whose sides is 24 inches long. Which of the following is closest to the fraction of the tabletop covered by the mat?

A,5/12

B,2/5

C,1/2

D,3/4

E.5/6
是圆的面积/正方形的面积吗?

作者: jackraywen    时间: 2010-7-4 20:20
对,是圆的面积比正方形的面积
作者: 谷雨书    时间: 2010-7-4 20:24
可是我算不出答案呢同学解答下好吗
作者: jackraywen    时间: 2010-7-4 20:56
100pie/(24*24),我看了一下,大概等于1/2吧。




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