已知数列{an}满足a1=-1,an=[(3n+3)an+4n+6]/n,bn=3^(n-1)/an+2.求数列an的通
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已知数列{an}满足a1=-1,an=[(3n+3)an+4n+6]/n,bn=3^(n-1)/an+2.求数列an的通向公式.设数列bn是的前n项和
已知数列{an}满足a1=-1,an=[(3n+3)an+4n+6]/n,bn=3^(n-1)/an+2.(1)求数列an的通向公式.(2)设数列bn是的前n项和为sn,求证n》2时,sn^2>2(s2/2+s3/3+...+sn/n
已知数列{an}满足a1=-1,an=[(3n+3)an+4n+6]/n,bn=3^(n-1)/an+2.(1)求数列an的通向公式.(2)设数列bn是的前n项和为sn,求证n》2时,sn^2>2(s2/2+s3/3+...+sn/n
![已知数列{an}满足a1=-1,an=[(3n+3)an+4n+6]/n,bn=3^(n-1)/an+2.求数列an的通](/uploads/image/z/4955080-40-0.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E6%BB%A1%E8%B6%B3a1%3D-1%2Can%3D%5B%283n%2B3%29an%2B4n%2B6%5D%2Fn%2Cbn%3D3%5E%28n-1%29%2Fan%2B2.%E6%B1%82%E6%95%B0%E5%88%97an%E7%9A%84%E9%80%9A)
已知数列{an}满足a1=-1,an=[(3n+3)an+4n+6]/n,bn=3^(n-1)/an+2.(1)求数列an的通向公式.(2)设数列bn是的前n项和为sn,求证n》2时,sn^2>2(s2/2+s3/3+...+sn/n
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