1、数列{an} 前n 项和Sn=-an-(1/2)的(n-1)次方+2(n为正整数)令cn=(n+1/n)an,tn=c1+c2+c3+...+cn,试求Tn值2、正项数列{an}前n项和Sn,方程x平方+4x-4Sn=0,有一根为an-1,求Tn=(1/S1)+(1/S2)+(1/S3)...+(1/Sn)求证:Tn
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![1、数列{an} 前n 项和Sn=-an-(1/2)的(n-1)次方+2(n为正整数)令cn=(n+1/n)an,tn=c1+c2+c3+...+cn,试求Tn值2、正项数列{an}前n项和Sn,方程x平方+4x-4Sn=0,有一根为an-1,求Tn=(1/S1)+(1/S2)+(1/S3)...+(1/Sn)求证:Tn](/uploads/image/z/14060594-2-4.jpg?t=1%E3%80%81%E6%95%B0%E5%88%97%7Ban%7D+%E5%89%8Dn+%E9%A1%B9%E5%92%8CSn%3D-an-%281%2F2%29%E7%9A%84%EF%BC%88n-1%EF%BC%89%E6%AC%A1%E6%96%B9%2B2%EF%BC%88n%E4%B8%BA%E6%AD%A3%E6%95%B4%E6%95%B0%EF%BC%89%E4%BB%A4cn%3D%28n%2B1%2Fn%29an%2Ctn%3Dc1%2Bc2%2Bc3%2B...%2Bcn%2C%E8%AF%95%E6%B1%82Tn%E5%80%BC2%E3%80%81%E6%AD%A3%E9%A1%B9%E6%95%B0%E5%88%97%7Ban%7D%E5%89%8Dn%E9%A1%B9%E5%92%8CSn%2C%E6%96%B9%E7%A8%8Bx%E5%B9%B3%E6%96%B9%2B4x-4Sn%3D0%2C%E6%9C%89%E4%B8%80%E6%A0%B9%E4%B8%BAan-1%2C%E6%B1%82Tn%3D%281%2FS1%29%2B%281%2FS2%29%2B%281%2FS3%29...%2B%281%2FSn%29%E6%B1%82%E8%AF%81%EF%BC%9ATn)
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