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已知数列{an},其前n项和为.(Ⅰ)求数列{an}的通项公式,并证明数列{an}是等差数...
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已知数列{a
n},其前n项和为
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AAAASUVORK5CYII=
)
.
(Ⅰ)求数列{a
n}的通项公式,并证明数列{a
n}是等差数列;
(Ⅱ)如果数列{b
n}满足a
n=log
2b
n,请证明数列{b
n}是等比数列,并求其前n项和.
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