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1·There is a simple formula of Bernoulli number with using extraction a derivative rule of compound function and progression theory and so a given important value in the theory and application.

利用复合函数的求导规则和级数理论能够得出 贝努利数的简明公式■ ，在理论和应用上都具有重要的价值。

2·Bernoulli discovered this number when studying a problem of compounding interest.

伯努利在研究一个复利问题的时候发现了这个数字。