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1.已知各项均为正数的数列{a_(n)}的前n项和为S_n,满足a_(n+1)~2=2S_n+n+4,且a_2-1,a_3,a_7恰为等比数列{b_n}的前3项。(1)求数列{a_n}、{b_n}的通项公式;(2)令C_n=n/b_n-1/a_na_(n+1),求数列{C_n}的前n项和{T_n}。
1. It is known that the first n terms of the series {a_ (n)} and all of the positive numbers satisfy a_ (n + 1) ~ 2 = 2S_n + n + 4 and a_2-1, a_3, a_7 Just for the first three items of the series {b_n}. (2) Let C_n = n / b_n-1 / a_na_ (n + 1) find the first n terms and {T_n} of the count column {C_n}.