(5-1)/5+(5²-1)/5²+(5³-1)/5³+.+(5的n次方-1)/5的N次方=?

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(5-1)/5+(5²-1)/5²+(5³-1)/5³+.+(5的n次方-1)/5的N次方=?

n-1/4+1/4X1/5^n

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