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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
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB8AAAAxCAYAAAAiCHJ/AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
的前n项和S
n.
相关试题
-
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.
-
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.
-
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
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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
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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.