等比数列{a n}的前n项和Sn=3^n+a,则a=?( )A.3.(错误答案).B.1.C.0.D.-1 [好像D是对的呐~为什么呢?我运用等比数列的性质,我选A,结果错了……哪里错了呢?】设等比数列{an}的前N项和味Sn,若S6/S3=3,则
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![等比数列{a n}的前n项和Sn=3^n+a,则a=?( )A.3.(错误答案).B.1.C.0.D.-1 [好像D是对的呐~为什么呢?我运用等比数列的性质,我选A,结果错了……哪里错了呢?】设等比数列{an}的前N项和味Sn,若S6/S3=3,则](/uploads/image/z/840045-21-5.jpg?t=%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%7Ba+n%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CSn%3D3%5En%2Ba%2C%E5%88%99a%3D%3F%EF%BC%88+%EF%BC%89A.3.%EF%BC%88%E9%94%99%E8%AF%AF%E7%AD%94%E6%A1%88%EF%BC%89.B.1.C.0.D.-1+%5B%E5%A5%BD%E5%83%8FD%E6%98%AF%E5%AF%B9%E7%9A%84%E5%91%90%7E%E4%B8%BA%E4%BB%80%E4%B9%88%E5%91%A2%3F%E6%88%91%E8%BF%90%E7%94%A8%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E7%9A%84%E6%80%A7%E8%B4%A8%2C%E6%88%91%E9%80%89A%2C%E7%BB%93%E6%9E%9C%E9%94%99%E4%BA%86%E2%80%A6%E2%80%A6%E5%93%AA%E9%87%8C%E9%94%99%E4%BA%86%E5%91%A2%3F%E3%80%91%E8%AE%BE%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8DN%E9%A1%B9%E5%92%8C%E5%91%B3Sn%2C%E8%8B%A5S6%2FS3%3D3%2C%E5%88%99)
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