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逻辑斯谛增长： \dot P = 0,06 P(1 - P/500) ， P(0) = 50 。种群何时达到承载量的一半？
逻辑斯谛增长： \dot P = 0,06 P(1 - P/500) ， P(0) = 50 。种群何时达到承载量的一半？
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