已知数列{an}的前n项和sn=3的n次方+k(k为常数)那么下述结论正确的是已知数列{an}的前n项和sn=3的n次方+k(k为常数)那么下述结论正确的是A:k为任意实数时,{an}是等比数列; B:k=-1时,{an}是等比
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![已知数列{an}的前n项和sn=3的n次方+k(k为常数)那么下述结论正确的是已知数列{an}的前n项和sn=3的n次方+k(k为常数)那么下述结论正确的是A:k为任意实数时,{an}是等比数列; B:k=-1时,{an}是等比](/uploads/image/z/2534675-59-5.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8Csn%3D3%E7%9A%84n%E6%AC%A1%E6%96%B9%2Bk%28k%E4%B8%BA%E5%B8%B8%E6%95%B0%29%E9%82%A3%E4%B9%88%E4%B8%8B%E8%BF%B0%E7%BB%93%E8%AE%BA%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8Csn%3D3%E7%9A%84n%E6%AC%A1%E6%96%B9%2Bk%EF%BC%88k%E4%B8%BA%E5%B8%B8%E6%95%B0%EF%BC%89%E9%82%A3%E4%B9%88%E4%B8%8B%E8%BF%B0%E7%BB%93%E8%AE%BA%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AFA%EF%BC%9Ak%E4%B8%BA%E4%BB%BB%E6%84%8F%E5%AE%9E%E6%95%B0%E6%97%B6%2C%7Ban%7D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%EF%BC%9B+B%EF%BC%9Ak%3D-1%E6%97%B6%2C%7Ban%7D%E6%98%AF%E7%AD%89%E6%AF%94)
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