已知数列an前n项和为Sn,且满足a1=4,Sn+Sn+1=5/3an+1
人气:323 ℃ 时间:2019-10-08 07:10:48
解答
林永嘉,把分给我把,哈哈.
Sn+S(n+1)=(5/3)a(n+1)=(5/3)[S(n+1)-Sn]
4Sn=Sn+1
Sn+1/Sn=4
则,Sn成等比数列
S1=a1
Sn=4*4^(n-1)=4^n
你的班长大人啊聪明啊.哈哈.不要崇拜姐啊.
再给点分.
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