條件下.記為正數(shù)數(shù)列的調(diào)和平均數(shù).若.為數(shù)列的前項和.為數(shù)列的調(diào)和平均數(shù).求, 查看更多

 

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由函數(shù)確定數(shù)列,,函數(shù)的反函數(shù)能確定數(shù)列,,若對于任意,都有,則稱數(shù)列是數(shù)列的“自反數(shù)列”。

(1)若函數(shù)確定數(shù)列的自反數(shù)列為,求的通項公式;

(2)在(1)條件下,記為正數(shù)數(shù)列的調(diào)和平均數(shù),若

為數(shù)列的前項和,為數(shù)列的調(diào)和平均數(shù),求;

(3)已知正數(shù)數(shù)列的前項之和。求的表達(dá)式。

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由函數(shù)y=f(x)確定數(shù)列{an},an=f(n),函數(shù)y=f(x)的反函數(shù)y=f-1(x)能確定數(shù)列{bn},bn=f-1(n),若對于任意n?N*,都有bn=an,則稱數(shù)列{bn}是數(shù)列{an}的“自反數(shù)列”.
(1)若函數(shù)f(x)=
px+1
x+1
確定數(shù)列{an}的自反數(shù)列為{bn},求an;
(2)在(1)條件下,記
n
1
x1
+
1
x2
+…
1
xn
為正數(shù)數(shù)列{xn}的調(diào)和平均數(shù),若dn=
2
an+1
-1
,Sn為數(shù)列{dn}的前n項之和,Hn為數(shù)列{Sn}的調(diào)和平均數(shù),求
lim
n→∞
=
Hn
n
;
(3)已知正數(shù)數(shù)列{cn}的前n項之和Tn=
1
2
(Cn+
n
Cn
)
.求Tn表達(dá)式.

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           由函數(shù)y=f(x)確定數(shù)列{an},an=f(n),函數(shù)y=f(x)的反函數(shù)y=f –1(x)能確定數(shù)列{bn},bn= f –1(n),若對于任意nÎN*,都有bn=an,則稱數(shù)列{bn}是數(shù)列{an}的“自反數(shù)列”.

   (1)若函數(shù)f(x)=確定數(shù)列{an}的自反數(shù)列為{bn},求an

   (2)在(1)條件下,記為正數(shù)數(shù)列{xn}的調(diào)和平均數(shù),若dn=,Sn為數(shù)列{dn}的前n項之和,Hn為數(shù)列{Sn}的調(diào)和平均數(shù),求

   (3)已知正數(shù)數(shù)列{cn}的前n項之和 求Tn表達(dá)式.

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由函數(shù)y=f(x)確定數(shù)列{an},an=f(n),函數(shù)y=f(x)的反函數(shù)y=f-1(x)能確定數(shù)列{bn},bn=f-1(n),若對于任意nÎN*,都有bn=an,則稱數(shù)列{bn}是數(shù)列{an}的“自反數(shù)列”.
(1)若函數(shù)f(x)=確定數(shù)列{an}的自反數(shù)列為{bn},求an
(2)在(1)條件下,記為正數(shù)數(shù)列{xn}的調(diào)和平均數(shù),若dn=,Sn為數(shù)列{dn}的前n項之和,Hn為數(shù)列{Sn}的調(diào)和平均數(shù),求;
(3)已知正數(shù)數(shù)列{cn}的前n項之和.求Tn表達(dá)式.

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由函數(shù)y=f(x)確定數(shù)列{an},an=f(n),函數(shù)y=f(x)的反函數(shù)y=f-1(x)能確定數(shù)列{bn},bn=f-1(n),若對于任意nÎN*,都有bn=an,則稱數(shù)列{bn}是數(shù)列{an}的“自反數(shù)列”.
(1)若函數(shù)f(x)=確定數(shù)列{an}的自反數(shù)列為{bn},求an
(2)在(1)條件下,記為正數(shù)數(shù)列{xn}的調(diào)和平均數(shù),若dn=,Sn為數(shù)列{dn}的前n項之和,Hn為數(shù)列{Sn}的調(diào)和平均數(shù),求;
(3)已知正數(shù)數(shù)列{cn}的前n項之和.求Tn表達(dá)式.

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