原创2006年8月数学机井讨论稿第1遍（答案给出

invisible

skyinseas, thanks a lot for the great work.

dasani

skyiness, you miss something at

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=185285&page=1

and

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=185360&page=1

Thanks for your hard work.

bestxuan

33.There have 500 employees in the company. 3/4 of the male and 1/2 of the female were unhealth from the health report. There have totally 300 employees are not healthy. How many female are unhealthy

答案是150吗？

sand18

以下是引用bestxuan在2006-8-4 10:59:00的发言：

33.There have 500 employees in the company. 3/4 of the male and 1/2 of the female were unhealth from the health report. There have totally 300 employees are not healthy. How many female are unhealthy

答案是150吗？

agree!

skyinseas

以下是引用dasani在2006-8-4 10:20:00的发言：

skyiness, you miss something at

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=185285&page=1

and

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=185360&page=1

Thanks for your hard work.

强烈感谢

skyinseas

以下是引用bestxuan在2006-8-4 10:59:00的发言：

33.There have 500 employees in the company. 3/4 of the male and 1/2 of the female were unhealth from the health report. There have totally 300 employees are not healthy. How many female are unhealthy

答案是150吗？

x+y=500;

0.75x+0.5y=300

所以 y＝300，答案为150

skyinseas

16 .DS:问X的百分位是不是0?(1)16x是整数(2)8x是整数

我选的是e，可以分别取0。5和0。25试试。

skyinseas

31.某厂昨天的每一件产品都要由X或Y检验,X的淘汰率是0.5%, Y的淘汰率是0.8%, 总的淘汰率是0.75%, 问Y检验的占总数的比例,

我的答案是 5/6

设x检测的数量是 x，y检测的数量是 y

那没有： 0。5×x+0.8y=0.75(x+y)

推出 x/y=1/5所以 y/(x+y)=5/6

skyinseas

25题的答案是a

skyinseas

21.全集合是30个人，15个人选了A，20个人选了B, 10个人两者都没选，问仅选A和仅选B的人？（数字可能有点吃不准了）

a：15 ；b：5