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烦请大家帮我看一下这两题,困惑了,还是看数字多了,大脑晕中。

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楼主
发表于 2011-10-9 14:57:48 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
165.16466-!-item-!-187;#058&010795
Of the 1,400 college teachers surveyed, 42 percent said that they considered engaging in research an essential goal.How many of the college teachers surveyed were women?
(1) In the survey, 36 percent of the men and 50 percent of the women said that they considered engaging in research an essential goal.
(2) In the survey, 288 men said that they considered engaging in research an essential goal.
--------------------------------------------------------------------------------------------------------------------------------------------------------【答案】A
【思路】(1) total1400) x 42%=588(參加人數) , 588 x women比例()=參加女人的比例 , 充份
(2)原題問surveyed werer women , 包含 engage not engage , so we only can get engage women , 不充份
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588人参加,但是条件一给出的是全部妇女中有50%认为参加研究很是一个重要的目标,如果588*40%似乎说不过去呀。
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沙发
 楼主| 发表于 2011-10-9 16:42:10 | 只看该作者

还有这个

196.19155-!-item-!-187;#058&012165
How many odd integers are greater than the integer x and less than the integer y ?
(1)There are 12 even integers greater than x and less than y.
(2)There are 24 integers greater than x and less than y.
--------------------------------------------------------------------------------------------------------------------------------------------------------【答案】B
【思路】
(1) 不知道有幾個數是介於x,y. 有可能奇數比偶數多1或少1
(2) 有一半是奇數
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条件1,既然是12,为什么可能奇数比偶数多1或者少1呢?这十二个要么是“奇偶奇偶....奇偶”要么是“偶奇偶奇....偶奇”呀?
板凳
 楼主| 发表于 2011-10-10 18:22:14 | 只看该作者
继续困惑中,自己顶一下,并求助
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