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微積分的問題，雙倍三倍的概念

27-30 MODELING, APPLICATIONS
27. Exponential growth. If the growth rate of a culture
of bacteria is proportional to the number of bacteria
present and after 1 day is 1.25 times the original
number, within what interval of time will the number
of bacteria (a) double, (b) triple?

微積分部分的問題 雙倍、三倍的概念