(5-1)/5+(5²-1)/5²+(5³-1)/5³+.+(5的n次方-1)/5的N次方=?
问题描述:
(5-1)/5+(5²-1)/5²+(5³-1)/5³+.+(5的n次方-1)/5的N次方=?
答
n-1/4+1/4X1/5^n
(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