设数列{an}的n项和为Sn,若对任意∈N*,都有.Sn=3an-5n(1)求数
题型:解答题
问题:
设数列{an}的n项和为Sn,若对任意∈N*,都有.Sn=3an-5n (1)求数列{an}的首项; (2)求证:数列{an+5}是等比数列,并求数列{an}的通项公式; (3)数列{bn}满足bn=
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设数列{an}的n项和为Sn,若对任意∈N*,都有.Sn=3an-5n (1)求数列{an}的首项; (2)求证:数列{an+5}是等比数列,并求数列{an}的通项公式; (3)数列{bn}满足bn=
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