数列{an}前n项和为Sn,已知a1=1|5,且对任意正整数m,n,都有am+n = am×an,若Sn

若数列an满足a1=1/3,且对任意正整数m,n都有am+n=am*an.设前n项和为sn,则s10-s9的值是? 若数列an满足a1=1/3,且对任意正整数m,n都有am+n=am*an.设前n项和为sn,则s10-s9等于? 设数列{an}的前n项和为Sn,若对任意正整数,都有Sn=n(a1+an)/2,证明{an}是等差数列. 已知等差数列an的首项a1为a,设数列的前n项和为Sn,且对任意正整数n都有a2n/an=4n-1/2n-1,求数列的通 已知数列an的前n项和为Sn,且对一切正整数n都有Sn=n^2+1/2an. 已知数列{an}的首项为a1=1，其前n项和为sn，且对任意正整数n有：n、an、Sn成等差数列． 已知数列｛an｝的前n项和为Sn,且对任意正整数n都有an是n与Sn的等差中项. 已知数列an的前n项和为sn,且对任意正整数n都有an是n与sn的等差中项(1)bn=an+1,求bn 设数列{an}的前n项和为Sn,且对任意正整数n,an+Sn=4096 在数列{an}中前n项和为Sn,且对任意正整数n,an+sn=2048 设数列{an}的前n项和为Sn，且对任意正整数n，an+Sn=4096． 数列{an}前n项和为Sn,对一切正整数n都有Sn=n+(1/2)an,求an,Sn