在等差数列{an}中,
(1)若a1=﹣20,a21=12,求公差d和前11项和S11.
(2)若a2+a4=4,a3+a5=10,求通项公式an及前n项和Sn.
(1)若a1=﹣20,a21=12,求公差d和前11项和S11.
(2)若a2+a4=4,a3+a5=10,求通项公式an及前n项和Sn.
2021高二·全国·专题练习 查看更多[1]
(已下线)本册内容检测(基础卷)-《阳光测评》2020-2021学年高二数学单元提升卷(人教A版2019选择性必修第二册)
更新时间:2021-10-06 13:41:52
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