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标题: 马上就要考试,急问两道数学题 [打印本页]

作者: xiaoapian    时间: 2004-10-26 03:41
标题: 马上就要考试,急问两道数学题

40%的人hold round trip tickets 同时也带了自己的car. 20%的人who hold round trip 没带car.问hold round trip tickets的人有百分之几


答案是否为60%


第二题:the sides of a square region,measured to the nearest centimeters are 6 centimeters long,the least possible value of the actual area of the square region is:


a.36.00


b.35.00


c.33.75


d.30.25


e.25.00


能否告知解题的过程?谢谢


作者: meixiapeng    时间: 2004-10-26 04:49

1.it seems imcomplete in the first question,how about the other 40%people who hold the ticket ? neither with  nor without the car?

2.the nearest centimeter of 5.5 is 6.so it should be 5.5x5.5.


作者: hchen_cd    时间: 2004-10-26 04:57

第一题见过,好像和你的说法不一样。按你的条件,设X%有round trip tickets. 那么他们中80%有车,所以X%*80%=40%(既有round trip tickets又有车),;因而X%=50%。

第二题,能够四舍五入到6的最小数是5.5, 所以最小可能的面积是5.5^2 = 30.25.






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