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标题: GWD-2-23 [打印本页]

作者: luckytu    时间: 2008-12-12 20:24     标题: GWD-2-23

Q23:

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, 可是我认为是C. 请哪位高人指点一下. 谢谢


作者: taotaobao    时间: 2008-12-13 07:22

(14.4/10)^1/2=1.2,则每三个小时增长1.2倍...
作者: luckytu    时间: 2008-12-13 19:49

还是不太明白, 能否解释的详细一点呢?多谢!
作者: himba    时间: 2008-12-14 07:06

告诉你每三个小时一次指数增长,开始是10克,3小时后是X克,6个小时后是

14.4克

那么如果设增长倍数是A,则:

X=10*A,

14.4=10*A^2

则通过第2个式子可以求出A,带入第一个式子,可以求出X...


作者: luckytu    时间: 2008-12-18 18:58

多谢楼主的详细讲解,终于明白了.确实是我把题目理解错了.




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