[原创]两个数学,一个看不懂题意,一个觉得答案错了, 大家看一下!!

williamweizh

Q10:

A certain quantity is measured on two different scales, the R-scale and the S-scale, that are related linearly.  Measurements on the R-scale of 6 and 24 correspond to measurements on the S-scale of 30 and 60, respectively.  What measurement on the R-scale corresponds to a measurement of 100 on the S-scale?

A.     20

B.     36

C.     48

D.     60

E.      84

看不懂题意，猜的correct answer is C.

Q28:

In 1994, Kenneth’s annual salary was 30 percent higher than it was in 1993.  In 1995, Kenneth’s annual salary was reduced to 104 percent of his 1993 annual salary.  Kenneth’s 1995 annual salary was what percent less than his 1994 annual salary?

A.      16%

B.       20%

C.      24%

D.      26%

E.       28%

correct answer is D, but my calculation is B

yangxiaogang

恭喜楼主猜对了第一题，也答对了第二题

以为是线性关系，设一个一般表达式，根据条件可求出系数，在反代入就可以求得答案了48

melissasun

。。第1题我也看不懂

第2题算的20％ ，B

melissasun

以下是引用williamweizh在2005-12-11 0:31:00的发言：

Q10:

A certain quantity is measured on two different scales, the R-scale and the S-scale, that are related linearly.  Measurements on the R-scale of 6 and 24 correspond to measurements on the S-scale of 30 and 60, respectively.  What measurement on the R-scale corresponds to a measurement of 100 on the S-scale?

A.     20

B.     36

C.     48

D.     60

E.      84

看不懂题意，猜的correct answer is C.

是不是linearlly?

翻译成线性关系那就懂了

[此贴子已经被作者于2005-12-11 11:50:50编辑过]

hitlzc

1. the R-scale and the S-scale, that are related linearly.指S、R是线形关系，所以可设S、R的关系为S=aR+b

由题意有30=6a+b

        60=24a+b

解得a=5/3,b=20

所以 当S=100时，有100=5/3R+20,解得R=48

2.我也选B

yuanlipinglily

第二题，我选b.

93年为1，94年为1.3，95年为1.04

（1.3-1.04)/1.3=20%

Youknowme

感谢分享!

williamweizh

谢谢大家,偶懂了!