当前位置:首页>python>Python赋能数学学习1: 月底阿凡提的豆子到底多少颗:指数增长的数学奥秘

Python赋能数学学习1: 月底阿凡提的豆子到底多少颗:指数增长的数学奥秘

  • 2026-07-02 16:43:36
Python赋能数学学习1: 月底阿凡提的豆子到底多少颗:指数增长的数学奥秘

阿凡提的豆子:指数增长的数学奥秘

一、故事内容

阿凡提的故事中有这样一个经典情节:

一位财主向阿凡提炫耀自己的财富,阿凡提说:"如果你能答应我一个条件,我可以让你变得更富有。"财主好奇地问是什么条件。

阿凡提说:"第一天你给我1颗豆子,第二天给我2颗,第三天给我4颗,第四天给我8颗……以后每一天给我的豆子数都是前一天的两倍,持续30天。"

财主心想:这算什么条件,每天才给这么点豆子,欣然同意了。

然而,当第30天到来时,财主才发现自己需要支付的豆子数量已经是一个天文数字……

二、对应的数学知识

这个故事涉及到的数学知识主要是等比数列指数增长

  • 等比数列:每一项都是前一项的固定倍数。在这个故事中,每一天的豆子数是前一天的两倍,形成了一个以2为公比的等比数列。

  • 指数增长:当数量以固定的倍数增长时,增长速度会越来越快,最终达到一个非常大的数值。

  • 现实意义:指数增长在自然界和社会中广泛存在,如细菌繁殖、复利计算、病毒传播等。理解指数增长有助于我们做出更明智的决策。

三、数学建模

问题分析

  1. 输入:天数 

  2. 输出


    • 第n天的豆子数:
    • 第一天的豆子数:
    • 第二天的豆子数:

数学模型

  • 当天豆子数
  • 累计豆子数

四、Python代码实现

## 输入n天n = 30for i in range(1, n + 1):    today_bean = 2 ** (i - 1)    count_bean = 2 ** i - 1    print(f"第{i}天\t今天的豆子数:{today_bean:,}\t累计豆子数:{count_bean:,}")

五、输出结果

运行上述代码,将得到如下输出:

第1天 今天的豆子数:1 累计豆子数:1第2天 今天的豆子数:2 累计豆子数:3第3天 今天的豆子数:4 累计豆子数:7第4天 今天的豆子数:8 累计豆子数:15第5天 今天的豆子数:16 累计豆子数:31第6天 今天的豆子数:32 累计豆子数:63第7天 今天的豆子数:64 累计豆子数:127第8天 今天的豆子数:128 累计豆子数:255第9天 今天的豆子数:256 累计豆子数:511第10天 今天的豆子数:512 累计豆子数:1,023第11天 今天的豆子数:1,024 累计豆子数:2,047第12天 今天的豆子数:2,048 累计豆子数:4,095第13天 今天的豆子数:4,096 累计豆子数:8,191第14天 今天的豆子数:8,192 累计豆子数:16,383第15天 今天的豆子数:16,384 累计豆子数:32,767第16天 今天的豆子数:32,768 累计豆子数:65,535第17天 今天的豆子数:65,536 累计豆子数:131,071第18天 今天的豆子数:131,072 累计豆子数:262,143第19天 今天的豆子数:262,144 累计豆子数:524,287第20天 今天的豆子数:524,288 累计豆子数:1,048,575第21天 今天的豆子数:1,048,576 累计豆子数:2,097,151第22天 今天的豆子数:2,097,152 累计豆子数:4,194,303第23天 今天的豆子数:4,194,304 累计豆子数:8,388,607第24天 今天的豆子数:8,388,608 累计豆子数:16,777,215第25天 今天的豆子数:16,777,216 累计豆子数:33,554,431第26天 今天的豆子数:33,554,432 累计豆子数:67,108,863第27天 今天的豆子数:67,108,864 累计豆子数:134,217,727第28天 今天的豆子数:134,217,728 累计豆子数:268,435,455第29天 今天的豆子数:268,435,456 累计豆子数:536,870,911第30天 今天的豆子数:536,870,912 累计豆子数:1,073,741,823

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  1. CONNECT:[ UseTime:0.000607s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000750s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000318s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000253s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000493s ]
  6. SELECT * FROM `set` [ RunTime:0.000199s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000499s ]
  8. SELECT * FROM `article` WHERE `id` = 494443 LIMIT 1 [ RunTime:0.002811s ]
  9. UPDATE `article` SET `lasttime` = 1783063316 WHERE `id` = 494443 [ RunTime:0.012231s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000333s ]
  11. SELECT * FROM `article` WHERE `id` < 494443 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000627s ]
  12. SELECT * FROM `article` WHERE `id` > 494443 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000440s ]
  13. SELECT * FROM `article` WHERE `id` < 494443 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002640s ]
  14. SELECT * FROM `article` WHERE `id` < 494443 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000904s ]
  15. SELECT * FROM `article` WHERE `id` < 494443 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.024733s ]
0.122290s