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5,55,555,5555的通項公式
5,55,555,5555的通項公式
更新时间:2025-11-22 18:26:26

  1、根據計算:

  a(1)=(5/9)×(101-1)=5;

  a(2)=(5/9)×(102-1)=55;

  a(3)=(5/9)×(103-1)=555;

  a(4)=(5/9)×(10^4-1)=5555;

  a(5)=(5/9)×(10^5-1)=55555。

  2、綜上所述,其通項公式為:a(n)=(5/9)×(10^n-1)。

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