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标题: 两个数学题，共勉！ [打印本页]

作者: lilya 时间: 2003-1-12 23:56 标题: 两个数学题，共勉！

有答案的捧个人场，没答案的一起从商量

1.For every dollar of sales charged to a certain band credit card,a department stroe must pay $0.003 to the bank that issued the credit card.What percentage of the department stored sales transaction last month were credit card transaction?
(1)the store made 2000 sales last month
(2)the store took in a total of $250,000 last month and paid #300 to the bank that issued the credit card

2. 242AB被15整除，A和B是不同的整数并都小于7，AxB的最大值是
(A)55
(B)40
(C)25
(D)15
(E)10

也欢迎EMAIL：lilya@yeah.net

作者: 卧室春竹 时间: 2003-1-13 00:11

哦..

第二题应该是15

A是3 B是5

作者: camelliayang 时间: 2003-1-13 00:43

第二题是10，A是2，B是5
第一题是E吧

作者: 卧室春竹 时间: 2003-1-13 00:52

哦
对10

我算错了 ..

第一个题目我也觉得是e...........

作者: niubi69 时间: 2003-1-13 02:19

我算得是25. A=5 B=5

作者: isenetlab 时间: 2003-1-13 11:23

2. 2AB =15*A*B,then 2AB is among 210, 225,240,255,270,285 since A!=B,A<7, B<7 so Max (A*B)=10 1.why not B? because of the different term?

作者: Mush 时间: 2003-1-13 12:44

以下是引用isenetlab在2003-1-13 11:23:03的发言： 2. 2AB =15*A*B,then 2AB is among 210, 225,240,255,270,285 since A!=B,A<7, B<7 so Max (A*B)=10 1.why not B? because of the different term?

因为虽然知道销售的钱数，但不知道有多少笔销售。恰恰题目问的是用信用卡的销售笔数，所以无从知晓。对吧。

作者: Mush 时间: 2003-1-13 12:47

以下是引用niubi69在2003-1-13 2:19:46的发言：
我算得是25. A=5 B=5

牛笔69，我知道你很牛笔，自从看了你所发表的贴子，我有种感觉，
你总是太粗心。
这题明明就说了ab不相等，你还算出这样的答案。
希望你能在细心点。

作者: margland 时间: 2003-1-13 14:21

第一题为什么是E?

作者: lilya 时间: 2003-1-13 19:20

谢谢各位朋友的热心回复！1题的答案是E，2题是10。这是Princeton的模考题。偶也是没有仔细看清题意。第一个需要注意问的是SALES!第2个要注意"Different".

作者: alvin 时间: 2003-1-14 06:30

if the key to Q2 is 10,the answer is wrong,
if the number can be divided by 15,the last digit should be 0 or 5,if it requested the max,5 is required in the last digit,the the whole number can be divided by 15,it should also be divided by 3,(2+4+2+a+b)/3=...which means (13+a)/5=...and the condition given is a,b are less tham 7,thus,the max number for a in this problem should be 5,thus a=5,b=5,the max ab=25

作者: niubi69 时间: 2003-1-14 06:41

是是是,我是太粗心.你说的对.

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