There is a simple formula of Bernoullinumber 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。
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Bernoulli discovered this number when studying a problem of compounding interest.