①已知数列{an}满足a1=1,a(n-1)+1/1-an(n属于N*,n>1)(1)求证：数列{1/an}为等差数列 (2)求数列{ana(n+1)}的前n项和为Sn②设数列{an}的前n项和为Sn,点（n,Sn/n）均在函数y=3x-31/2的图像上.求数列的第几项时,Sn

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