来自冯圣中的问题
设数列[an}的前n项和为Sn,a1=a,a2=p(p>0),Sn=n(an-a1)/2(1)求a的值(2)求证数列{an}是等差数列(3)求证(an-1)/(an+1)<1
设数列[an}的前n项和为Sn,a1=a,a2=p(p>0),Sn=n(an-a1)/2
(1)求a的值
(2)求证数列{an}是等差数列
(3)求证(an-1)/(an+1)<1
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2020-04-22 20:19