-0.5,0.55,-0.555,0.5555,……的通项公式

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-0.5,0.55,-0.555,0.5555,……的通项公式-0.5,0.55,-0.555,0.5555,……的通项公式-0.5,0.55,-0.555,0.5555,……的通项公式an=5/9*

-0.5,0.55,-0.555,0.5555,……的通项公式
-0.5,0.55,-0.555,0.5555,……的通项公式

-0.5,0.55,-0.555,0.5555,……的通项公式
an=5/9*[1-10^(-n)]*(-1)^(n)