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种群 P(t) = 100 + 5t^2 个个体。通过导数定义计算 t = 4 年时的增长率。（答： 40 个个体/年。）
种群 P(t) = 100 + 5t^2 个个体。通过导数定义计算 t = 4 年时的增长率。（答： 40 个个体/年。）
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