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标题: 请教3道数学 [打印本页]

作者: mike1025    时间: 2007-12-19 17:11
标题: 请教3道数学

1 In may, A(一个人) sold 15 used cars. For these 15 cars, the range of the selling price is $15000-$4500. In June,A sold 10 used cars , the range of the price is $16500-$6100. What was the range of the selling prices of the 25 used cars?

A $15600

B $15750

C $16820

D $18100

E $19200

答案是D,但是range不是值域么,怎么是一个确定的数啊??

2if 500 is the multiple of 100 that is closest to X and 400 is the multiple of 100 that is closest to Y. Which multiple of 100 is closest to X+Y?

1 x<500

2 y<400

完全不知道这个题是什么意思...

3Is the three-digit number N<550?

1 the product of the digits is 30

2 the sum of the digits is 10

答案是C,但是我觉得既然每一位的乘积是30,那只可能是2 3 5啊,最大也就只可能是532,那就应该选A呀..

还有点心理上的问题,我还有7天就考试了,最近做题的正确率都还比较高,今天prep模了一次(第二套,以前没有做过)750,但是我总觉得自己的实力没有这么高啊,因为准备的前期做了很多的题,所以今天的prep里面好多题都是做过的,特别是CR,基本都是做过的,而且阅读也遇到结构比较明显的,所以担心考试的时候都没有见过的题一下就完了,不知道XDJM们考前有没有这种感觉哦?


作者: prayer    时间: 2007-12-19 17:55
以下是引用mike1025在2007-12-19 17:11:00的发言:

1 In may, A(一个人) sold 15 used cars. For these 15 cars, the range of the selling price is $15000-$4500. In June,A sold 10 used cars , the range of the price is $16500-$6100. What was the range of the selling prices of the 25 used cars?

A $15600

B $15750

C $16820

D $18100

E $19200

答案是D,但是range不是值域么,怎么是一个确定的数啊??

2if 500 is the multiple of 100 that is closest to X and 400 is the multiple of 100 that is closest to Y. Which multiple of 100 is closest to X+Y?

1 x<500

2 y<400

完全不知道这个题是什么意思...

3Is the three-digit number N<550?

1 the product of the digits is 30

2 the sum of the digits is 10

答案是C,但是我觉得既然每一位的乘积是30,那只可能是2 3 5啊,最大也就只可能是532,那就应该选A呀..

还有点心理上的问题,我还有7天就考试了,最近做题的正确率都还比较高,今天prep模了一次(第二套,以前没有做过)750,但是我总觉得自己的实力没有这么高啊,因为准备的前期做了很多的题,所以今天的prep里面好多题都是做过的,特别是CR,基本都是做过的,而且阅读也遇到结构比较明显的,所以担心考试的时候都没有见过的题一下就完了,不知道XDJM们考前有没有这种感觉哦?

前两道我也不明白什么意思。

第三题,product是30,可能是1×5×6,2×3×5


作者: michaelwzg    时间: 2007-12-19 18:03

不是题有问题,就是我们有问题

完全读不懂,索性就不看了


作者: mike1025    时间: 2007-12-19 18:05
应该不是题有问题哦,这个是prep上的题啊




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