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标题: [求助]涛涛GWD2-23 [打印本页]

作者: lingdangyour    时间: 2008-6-14 18:56     标题: [求助]涛涛GWD2-23

AMOUNT OF BACTERIA PRESENT

Time

Amount

1:00 P.M.

10.0 grams

4:00 P.M.

x grams

7:00 P.M.

14.4 grams

 

Data for a certain biology experiment are given in the table above.  If the amount of bacteria present increased by the same
   fraction during each of the two 3-hour periods shown, how many grams of bacteria were present at 4:00 P.M.?

 

A.     12.0

B.     12.1

C.     12.2

D.     12.3

E.      12.4

答案是A。

请问一下,by the same fraction是什么意思?谢谢!


作者: forgetviviva    时间: 2008-6-15 07:24

10*x*x=14.4

x=1.2

thus at 4:00pm, there are 10*x=12 grams

作者: marinezhenger    时间: 2008-6-15 09:49

upupup

我想问一下,这个题为什么不是10(1+X)(1+X)=14。4

increased by the same fraction是什么意思?什么时候是乘1+X,什么时候是X

谢谢解答
作者: hedongshi    时间: 2008-6-16 06:35

 乘(1+X)或X都是可以的,乘什么到后面就用10去乘那个数

by the same fraction 应该是说每3个小时增加的百分数都相同
作者: marinezhenger    时间: 2008-6-16 20:53



为什么不是10(1+X)(1+X)=14。4

increased by the same fraction是什么意思?什么时候是乘1+X,什么时候是X




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