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逻辑斯蒂映射 x_(n+1) = r x_n (1 - x_n) 。 算极限。？（答：4 周期。）
逻辑斯蒂映射 x_(n+1) = r x_n (1 - x_n) 。 算极限。？（答：4 周期。）
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