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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.
-
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.
-
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.