标题: 请教prep数学题。。。 [打印本页] 作者: 挞兜 时间: 2011-11-27 22:14 标题: 请教prep数学题。。。 RT 在下数学真心弱。。。见笑了。。。望各位NN不吝赐教。。~ 拜谢~ 1. For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n, inclusive. If p is the smallest prime factor of h(100) +1, then p is A. between 2 and 10 B.between 10 and 20 C.between 20 and 30 D.between 30 and 40 E.greater than 40 答案是E。。。
2.According to the directions on a can of frozen orange juice concentrate. 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12-ounce cans of the concentrate are required to prepare 2006-ounce services of orange juice? 答案是25.。。 但是我怎么算都是40上下、。。纠结
3. The residents of Town X participated in a survey to determine the number of hours per week each resident spent watching televition. The distribution of the survey had a mean of 21 hours and a standard deviation of the survey had a mean of 21 hours and a standard deviation of 6 hours. The number of hours that Pat, a resident of Town X, watched televition last week was 1 and 2 standard deviation below the mean.(这句话看得不是很懂。。) Which of following could be the hours Pat watched TV last week? A.30 B.20 C.18 D.12 E.6 答案是D.12 4. x,y,z 都是大于1 的整数，求X+Y+Z? (DS题) a.xyz=70 b.(x/yz)=(7/10)
原题是“ 200个6-Ounce servings of orange juice”而不是“2006-Ounce servings of orange juice”，难怪你解不出来。
-- by 会员 fdunan (2011/11/27 22:31:26)
这个。。为什么是200*6？ 所以题目是说200份6盎司的果汁吗？。。。作者: 挞兜 时间: 2011-11-27 22:37
这个。。看明白了。。 太谢谢了。。。太丢人了。。。作者: fdunan 时间: 2011-11-27 22:38
楼主你用的什么版本？如果编排不清楚，趁早扔了看其他版本，免得纠结。作者: fdunan 时间: 2011-11-27 22:43
第三题题目表述也错了，应该是“The number of hours that Pat, a resident of Town X, watched television last week was between 1 and 2 standard deviations below the mean.” 差了between会害死人的。 所以答案应该在9(=21-2*6)和15(=21-6)之间作者: 挞兜 时间: 2011-11-27 22:46
第三题题目表述也错了，应该是“The number of hours that Pat, a resident of Town X, watched television last week was between 1 and 2 standard deviations below the mean.” 差了between会害死人的。 所以答案应该在9(=21-2*6)和15(=21-6)之间
-- by 会员 fdunan (2011/11/27 22:43:29)
OH,OH，between 是有的，我打题目漏掉了。。。 不好意思。。 我是在用PREP模考软件模考来的作者: 挞兜 时间: 2011-11-27 22:48
所以 between 1 and 2 standard deviation 是标准差的一倍到两倍的意思吗？。。。作者: fdunan 时间: 2011-11-27 22:49
第4题： (a) xyz=70=2*5*7 x，y，z必然是2、5、7中的某一个，不管具体值如何x+y+z=14 所以(a)充分作者: fdunan 时间: 2011-11-27 22:53
所以 between 1 and 2 standard deviation 是标准差的一倍到两倍的意思吗？。。。
) Which of following could be the hours Pat watched TV last week?
