cn=-6n^2,其前n项和为Tn,求Tn

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cn=-6n^2,其前n项和为Tn,求Tncn=-6n^2,其前n项和为Tn,求Tncn=-6n^2,其前n项和为Tn,求Tn

cn=-6n^2,其前n项和为Tn,求Tn
cn=-6n^2,其前n项和为Tn,求Tn

cn=-6n^2,其前n项和为Tn,求Tn