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设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21...
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设{a
n}是等差数列,{b
n}是各项都为正数的等比数列,且a
1=b
1=1,a
3+b
5=21,a
5+b
3=13
(Ⅰ)求{a
n}、{b
n}的通项公式;
(Ⅱ)求数列
的前n项和S
n.
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设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13
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(Ⅱ)求数列的前n项和Sn.
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(Ⅰ)求{an}、{bn}的通项公式;
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设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13
(Ⅰ)求{an}、{bn}的通项公式;
(Ⅱ)求数列的前n项和Sn.
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设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13
(Ⅰ)求{an}、{bn}的通项公式;
(Ⅱ)求数列的前n项和Sn.
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设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13
(Ⅰ)求{an}、{bn}的通项公式;
(Ⅱ)求数列的前n项和Sn.
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设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13
(Ⅰ)求{an}、{bn}的通项公式;
(Ⅱ)求数列的前n项和Sn.
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设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13
(Ⅰ)求{an}、{bn}的通项公式;
(Ⅱ)求数列的前n项和Sn.
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设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13
(Ⅰ)求{an}、{bn}的通项公式;
(Ⅱ)求数列的前n项和Sn.