作者chingyes (axsazxc)
看板trans_math
标题[积分] 超难
时间Fri Dec 5 08:58:06 2008
The growth rate of certain bacteria culture is proportional to its size .
If the bacteria culture double in size every 20 minutes
, how long will it take for the culture to increase twelve-fold?
请神人帮忙＠＠
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※ 编辑: chingyes 来自: 61.31.138.157 (12/05 08:59)
1F：→ yhliu:P'(t)=kP(t) and P(t+20)=2P(t) 218.170.19.80 12/05 12:57
2F：→ yhliu:求 t* 使 P(t*)=13P(0). 218.170.19.80 12/05 12:59
3F：→ chingyes:good! 219.81.150.95 12/06 11:14