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标题: 大家可以帮我看看新东方ps里的这两题吗？ [打印本页]

作者: 2045977 时间: 2004-5-12 18:51
标题: 大家可以帮我看看新东方ps里的这两题吗？

section 38

15. In a certain game, a large container is filled with red, yellow, green, and blue beads worth, respectively, 7, 5, 3, and 2 points each. A number of beads are then removed from the container. If the product of the point values of the removed beads is 147,000, how many red beads were removed?

(A) 5

(B) 4

(D) 2

(E) 0

section 42

9. A wildlife preserve is being planned for 3,000 rhinoceroses. The preserve is to contain a total of 10,000 acres of watering area, plus 100 acres of grazing area for each rhinoceros. If the number of rhinoceroses is expected to increase by 10 percent, how many thousand acres should the preserve have in order to provide for the increased population?

(A) 340

(B) 330

(D) 310

(E) 300

偶笨笨的，大家帮我看看吧，谢谢大家了！

作者: ios 时间: 2004-5-12 23:01

38 14700含有因子7的个数，14700＝2^2*3*5^2*7^2,答案d；

42 3000*(1+10%)*100/1000=330, b.

作者: 2045977 时间: 2004-5-12 23:13

ios 兄，我做38题的时候也对14700进行过你这样的因式分解，可是这样的分解是各个数字相乘啊，而被remove出来的珠珠的数目应该是相加呀？所以我有点疑惑，你能再解释清楚点吗？

42题，我没有理解题目的意思。 The preserve is to contain a total of 10,000 acres of watering area，不管多少头犀牛，这个watering area 的大小是不会变了，增加的犀牛只会引起那个each grazing area 的增加。谢谢你！

真的谢谢你抽时间为我解答题目

作者: xiaolihan 时间: 2004-5-13 00:44

9. increased population means the population after increase.

So the population is: 3000*(1+10%)=3300

The area needed is:10,000+3300*100=340,000

The answer is 340

作者: 2045977 时间: 2004-5-13 17:56
谢谢xiaolihan jj为我解答，第9题我已经明白了，回ios gg的贴的时候误导你了，还是谢谢你！我不太明白的是第15题，那个珠珠数目的题目。你也可以为我看看吗？谢谢！

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