已知Sn是等差数列{an}的前n 项和,且a5>0,a3+a80的正整数n的最大值是?
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(1)已知数列an的前n项和为sn满足sn=an²+bn,求证an是等差数列(2)已知等差数列an的前n项和为sn,求证数列sn/n也成等差数列
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