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Exponential population growth models how a population increases when resources are unlimited. P(t) = P₀ × e^(rt). Real populations are limited by carrying capacity.

ステップバイステップガイド

1. 1P(t) = P₀ × e^(rt)
2. 2Doubling time T₂ = ln(2)/r ≈ 0.693/r
3. 3r = ln(Pt/P₀)/t
4. 4Negative r = population decline

解いた例