prep题目请教！

2017 · 发表于 2011-4-7 09:43:36

1. If n and p are integers, is p>o?
(1) n+1>0
(2) np>0
2. Store S sold a total of 90 copies of a certain book during the seven days of last week, and it sold different numbers of copies on any two of the days. If for the seven days store S sold the greatest number of copies on Saturday and the second greatest number of copies on Friday, did store S sell more than 11 copies on Friday?
(1) Last week store S sold 8 copies of the books on Thursday
(2) Last week store S sold 38 copies of the books on Saturday
3. If y is an integer and y = |x|+x, is y = 0?
(1) x<0
(2) y<1

DarthWalker · 发表于 2011-4-7 10:05:21

好像是EBA？

zhgoqiang · 发表于 2011-4-7 10:17:33

1.选E。n>-1和np>0不能确定p的大小（-1<n<0和n>0两种情况）
2.选B。若周六卖38本，剩52本。如果周五卖的没有MORE THAN 11，那么周五最多是11本，还剩52-11=41本。因为周五卖的是第二多的，剩下5天最多卖10+9+8+7+6=40本<41本，所以周五一定多于11本
3.选A。若y<1,当0<y<1时，条件y=|x|+x成立而y不等于0。（|x|+x大于等于0）
个人意见，若有问题请指出一起讨论

boqiao · 发表于 2011-4-7 15:03:30

第1题我感觉是C 因为题中说n是整数啊
为什么选E啊？

zhgoqiang · 发表于 2011-4-7 15:44:51

第1题我感觉是C 因为题中说n是整数啊
为什么选E啊？

-- by 会员 boqiao (2011/4/7 15:03:30)

同意你的看法，我漏看条件了。

2017 · 发表于 2011-4-8 03:16:15

不好意思，LZ发完去睡觉了。。。答案是C B D。我不明白的地方：
1. 谢谢细心的boqiao，我确实忽略他们是整数这个条件。这样的话第一个条件得到n>-1,第二个条件得到n不=0，这样的话n一定>0，所以p>0
2. zhgoqiang能帮忙解释一下条件（1）为什么不成立吗？
3. 我也选了A

2017 · 发表于 2011-4-8 03:17:32

我想我知道第三题为什么是D了。当时也是漏了y是整数这个条件

2017 · 发表于 2011-4-8 08:11:00

再问两个问题哈：
1. If d is a positive integer and f is the product of the first 30 positive integers, what is the value of d?
(1) 10^d is a factor of f
(2) d>6
2. Ann($450,000), Bob($360,000), Cal($190,000), Dot($210,000),Ed($680,000)
The table above shows the total sales recorded in July for the 5 salespeople at Acme Truck Sales. It was discovered that one of Cal's sales was incorrectly recorded as one of Ann's sales. After this error was corrected, Ann's total sales were still higher than Cal's total sales, and the median of the 5 sales totals was $330,000. What was the value of the incorrectly recorded sale?

DarthWalker · 发表于 2011-4-8 11:04:13

30 25 20 15 10 5
5 5^2 5 5 5 5
5^7
C

68 45 36 21 19
45+19/2=32
so Ann is larger than 32, Cal is smaller than 32
so the new median 33 must be Ann
thus 45-33=12(0,000)

2017 · 发表于 2011-4-8 11:27:37

30 25 20 15 10 5
5 5^2 5 5 5 5
5^7
C

68 45 36 21 19
45+19/2=32
so Ann is larger than 32, Cal is smaller than 32
so the new median 33 must be Ann
thus 45-33=12(0,000)

-- by 会员 DarthWalker (2011/4/8 11:04:13)

1. 姐以后碰到这种题一定把数字都列出来。25里有两个5。。。
2. 姐没读懂题。。阅读差

prep题目请教！

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