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已知等差数列{an}满足:a3=7,a5+a7=26.{an}的前n项和为Sn.(Ⅰ)求a...
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已知等差数列{a
n}满足:a
3=7,a
5+a
7=26.{a
n}的前n项和为S
n.
(Ⅰ)求a
n及S
n;
(Ⅱ)令
(n∈N
*),求数列{b
n}的前n项和T
n.
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