已知.則常數(shù)的值為-------------( ) () , 查看更多

 

題目列表(包括答案和解析)

已知,數(shù)列(常數(shù)),對(duì)任意的正整數(shù),并有滿(mǎn)足.

(1)求的值;

(2)試確定數(shù)列是不是等差數(shù)列,若是,求出其通項(xiàng)公式;若不是,說(shuō)明理由;

(3)對(duì)于數(shù)列,例如存在一個(gè)常數(shù)使得對(duì)任意的正整數(shù)都有,則稱(chēng)為數(shù)列的“上漸進(jìn)值”,令,求數(shù)列的“上漸進(jìn)值”.

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已知,數(shù)列{an}有a1=a,a2=2,對(duì)任意的正整數(shù)n,Sn=a1+a2+…+an,并有Sn滿(mǎn)足Sn=
n(an-a1)
2

(1)求a的值;
(2)求證數(shù)列{an}是等差數(shù)列;
(3)對(duì)于數(shù)列{bn},假如存在一個(gè)常數(shù)b使得對(duì)任意的正整數(shù)n都有bn<b且
lim
n→∞
bn=b
,則稱(chēng)b為數(shù)列{bn}的“上漸進(jìn)值”,令pn=
Sn+2
Sn+1
+
Sn+1
Sn+2
,求數(shù)列{p1+p2+…+pn-2n}的“上漸進(jìn)值”.

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已知,數(shù)列{an}有a1=a,a2=2,對(duì)任意的正整數(shù)n,Sn=a1+a2+…+an,并有Sn滿(mǎn)足
(1)求a的值;
(2)求證數(shù)列{an}是等差數(shù)列;
(3)對(duì)于數(shù)列{bn},假如存在一個(gè)常數(shù)b使得對(duì)任意的正整數(shù)n都有bn<b且,則稱(chēng)b為數(shù)列{bn}的“上漸進(jìn)值”,令,求數(shù)列{p1+p2+…+pn-2n}的“上漸進(jìn)值”.

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已知,數(shù)列{an}有a1=a,a2=2,對(duì)任意的正整數(shù)n,Sn=a1+a2+…+an,并有Sn滿(mǎn)足
(1)求a的值;
(2)求證數(shù)列{an}是等差數(shù)列;
(3)對(duì)于數(shù)列{bn},假如存在一個(gè)常數(shù)b使得對(duì)任意的正整數(shù)n都有bn<b且,則稱(chēng)b為數(shù)列{bn}的“上漸進(jìn)值”,令,求數(shù)列{p1+p2+…+pn-2n}的“上漸進(jìn)值”.

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已知,數(shù)列{an}有a1=a,a2=2,對(duì)任意的正整數(shù)n,Sn=a1+a2+…+an,并有Sn滿(mǎn)足
(1)求a的值;
(2)求證數(shù)列{an}是等差數(shù)列;
(3)對(duì)于數(shù)列{bn},假如存在一個(gè)常數(shù)b使得對(duì)任意的正整數(shù)n都有bn<b且,則稱(chēng)b為數(shù)列{bn}的“上漸進(jìn)值”,令,求數(shù)列{p1+p2+…+pn-2n}的“上漸進(jìn)值”.

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