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5,55,555,5555的通项公式
更新时间: 2021-04-07 06:03:05  

1、根据计算:

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、综上所述,其通项公式为:a(n)=(5/9)×(10^n-1)。

关键词: 公式

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