若數(shù)列.

滿足

(

,d為常數(shù)),則稱數(shù)列

為“調(diào)和數(shù)列”..已知數(shù)列

為“調(diào)和數(shù)列”,且

,則

的最大值是
練習(xí)冊系列答案
相關(guān)習(xí)題
科目:高中數(shù)學(xué)
來源:不詳
題型:解答題
(本小題滿分12分)
已知數(shù)列

滿足

,點

在直線

上.
(Ⅰ)求數(shù)列

的通項公式;
(Ⅱ)若數(shù)列

滿足

求


的值;
(Ⅲ)對于(II)中的數(shù)列

,求

的值

查看答案和解析>>
科目:高中數(shù)學(xué)
來源:不詳
題型:單選題
已知等比數(shù)列

的前n項和為

,則x的值為
查看答案和解析>>
科目:高中數(shù)學(xué)
來源:不詳
題型:解答題
(本小題滿分14分)
數(shù)列

的前n項和為


(I)求

的通項公式;
(II)求證:

查看答案和解析>>
科目:高中數(shù)學(xué)
來源:不詳
題型:解答題
已知數(shù)列

的前n項和為

,且2

(1)設(shè)

,求數(shù)列

的通項公式;
(2)證明:

查看答案和解析>>
科目:高中數(shù)學(xué)
來源:不詳
題型:填空題
古希臘數(shù)學(xué)家把數(shù)1,3,6,10,15,21,…叫做三角數(shù),它們有一定的規(guī)律性,第30個三角數(shù)與第28個三角數(shù)的差為
.

查看答案和解析>>
科目:高中數(shù)學(xué)
來源:不詳
題型:填空題
在數(shù)列

中,

,且

,則該數(shù)列中相鄰兩項乘積的最小值為__________.
查看答案和解析>>
科目:高中數(shù)學(xué)
來源:不詳
題型:單選題
設(shè){a
n}是有正數(shù)組成的等比數(shù)列,

為其前n項和。已知

,

,則

( )
查看答案和解析>>