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例2:设数列{an}满足关系式:a1=-1,an=试证:(1)试求数列{an}的通项公式....
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例2:设数列{a
n}满足关系式:a
1=-1,a
n=
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJwAAAAjCAYAAABhJGPtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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j6XEi1ojima6ZNh5ailzMkdEr4o6up7yMku+nTmlk8QST5uCB9VZzTZrMqXeiaWezgJpQndKebu9
iDCmxa4cO6NFxwr5KIobn8sE8BwRvZpsYpmCJqbSzss1uROtq9OpSslWFskQS4tY0/pwquNpHB+r
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Z62H8JQIN8QyzGPEHzwdeTZTh7fCAAAAAElFTkSuQmCC
)
试证:(1)试求数列{a
n}的通项公式.
(2)b
n=lg(a
n+9)是等差数列.
(3)若数列{a
n}的第m项的值
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGYAAAAjCAYAAABmSn+9AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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Hy7cSXZxhaONmosWcAp4LimtotHetZQYmPPV6M7zrXj91KiFvcEHTicUKAuBoXMoHiFosCoJJtSa
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AfMyfbONGv01Y+Um8WWHlG3UFzAynX9C6gGmU5gfYB5gOrVAp2r9A8qQaBvvz8m+AAAAAElFTkSu
QmCC
)
,试求m
相关试题
-
例2:设数列{an}满足关系式:a1=-1,an=
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJwAAAAjCAYAAABhJGPtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
试证:(1)试求数列{an}的通项公式.
(2)bn=lg(an+9)是等差数列.
(3)若数列{an}的第m项的值
,试求m
-
已知a1=2,点(an,an+1)在函数f(x)=x2+2x的图象上,其中n=1,2,3,…
(1)证明:数列{lg(1+an)}是等比数列,并求数列{an}的通项公式;
(2)记bn=
+
,求数列{bn}的前n项和Sn.
-
已知a1=2,点(an,an+1)在函数f(x)=x2+2x的图象上,其中n=1,2,3,…
(1)证明:数列{lg(1+an)}是等比数列,并求数列{an}的通项公式;
(2)记bn=
+
,求数列{bn}的前n项和Sn.
-
已知数列{an}的前n项和为{Sn},又有数列{bn}满足关系b1=a1,对n∈N*,有an+Sn=n,bn+1=an+1-an
(1)求证:{bn}是等比数列,并写出它的通项公式;
(2)是否存在常数c,使得数列{Sn+cn+1}为等比数列?若存在,求出c的值;若不存在,说明理由.
-
已知数列(an}为Sn且有a1=2,3Sn=5an-an-1+3Sn-1 (n≥2)
(I)求数列{an}的通项公式;
(Ⅱ)若bn=(2n-1)an,求数列{bn}前n和Tn
(Ⅲ)若cn=tn[lg(2t)n+lgan+2](0<t<1),且数列{cn}中的每一项总小于它后面的项,求实数t取值范围.
-
已知数列{an}满足:a1=0,
,n=2,3,4,….
(Ⅰ)求a5,a6,a7的值;
(Ⅱ)设
,试求数列{bn}的通项公式;
(Ⅲ)对于任意的正整数n,试讨论an与an+1的大小关系.
-
已知数列{an}满足:a1=0,
,n=2,3,4,….
(Ⅰ)求a5,a6,a7的值;
(Ⅱ)设
,试求数列{bn}的通项公式;
(Ⅲ)对于任意的正整数n,试讨论an与an+1的大小关系.
-
已知数列{an}满足:a1=0,
,n=2,3,4,….
(Ⅰ)求a5,a6,a7的值;
(Ⅱ)设
,试求数列{bn}的通项公式;
(Ⅲ)对于任意的正整数n,试讨论an与an+1的大小关系.
-
已知数列{an}的前n项和Sn和通项an之间满足关系
,
(1)求数列{an}的通项公式;
(2)设f(x)=log3x,bn=f(a1)+f(a2)+…+f(an),
+…
求证:Tn<2.
-
已知数列{an}中a1=2,点(an,an+1) 在函数f(x)=x2+2x的图象上,n∈N*.数列{bn}的前n项和为Sn,且满足
b1=1,当n≥2时,Sn2=bn(Sn-
)
(1)证明数列{lg(1+an)}是等比数列;
(2)求Sn;
(3)设Tn=(1+a1)(1+a2)…(1+an)cn=
,求Tn•(c1+c2+c3+…+cn)的值.