已知Sn是等差数列An的前n项和,6,已知S6=36,Sn=360,Sn-6=21,求项数n 求详细解题过程,谢谢,急求!已知Sn是等差数列An的前n项和,已知S6=36,Sn=360,Sn-6=216,求项数n 不好意思写错了,真的不好意思
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