求数列:3/2,13/4,41/8.,(2n-1+1/(2^n)).前n项和?
RT 2^n表示2的n次方
人气：435 ℃ 时间：2020-05-11 22:44:21
解答
3/2=1+1/2
13/4=3+1/4
41/8=5+1/8
……
Sn=（1+3+5+……+2n-1）+（1/2+1/4+1/8……+1/2*n）
=n*2+（1/2）*n
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