試題分析:若
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024756146451.png)
為等比數(shù)列,且
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024756162630.png)
,則
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024756162649.png)
.所以
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/201408240247561771485.png)
,所以
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024756193509.png)
,而
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024756208730.png)
.故選A.
練習冊系列答案
相關(guān)習題
科目:高中數(shù)學
來源:不詳
題型:解答題
已知數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824031709121413.png)
滿足:
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/201408240317091371275.png)
(1)求
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824031709152535.png)
的值;
(2)求證:數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824031709168510.png)
是等比數(shù)列;
(3)令
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824031709183842.png)
(
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824031709199555.png)
),如果對任意
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824031709215524.png)
,都有
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824031709230685.png)
,求實數(shù)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824031709246261.png)
的取值范圍.
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:解答題
已知點(1,
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501441324.png)
)是函數(shù)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501457730.png)
且
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501472376.png)
)的圖象上一點,等比數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501488457.png)
的前
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501504277.png)
項和為
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501519549.png)
,數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501535475.png)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501550556.png)
的首項為
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501566237.png)
,且前
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501504277.png)
項和
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501597388.png)
滿足
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501597388.png)
-
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501628426.png)
=
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501644449.png)
+
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501660488.png)
(
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501660435.png)
).
(1)求數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501488457.png)
和
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501535475.png)
的通項公式;
(2)求數(shù)列{
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501706590.png)
前
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501504277.png)
項和為
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501738373.png)
,問
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501738373.png)
>
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501769537.png)
的最小正整數(shù)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024501504277.png)
是多少?
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:解答題
已知數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008098456.png)
滿足
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008114371.png)
,
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008145707.png)
(
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008161435.png)
且
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008176503.png)
).
(Ⅰ)求數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008098456.png)
的通項公式
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008192348.png)
;
(Ⅱ)令
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/201408240240082071376.png)
,記數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008223495.png)
的前
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008239297.png)
項和為
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008363388.png)
,若
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008363523.png)
恒為一個與
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008239297.png)
無關(guān)的常數(shù)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008395323.png)
,試求常數(shù)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008410283.png)
和
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024008395323.png)
.
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:填空題
定義一種運算“*”對于正整數(shù)滿足以下運算性質(zhì):(1)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824030227439533.png)
;(2)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824030227517803.png)
,則
.
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:填空題
無窮數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406631415.png)
中,
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406647546.png)
是首項為10,公差為
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406662280.png)
的等差數(shù)列;
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406678604.png)
是首項為
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406693319.png)
,公比為
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406693319.png)
的等比數(shù)列(其中
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406818634.png)
),并且對于任意的
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406834461.png)
,都有
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406849508.png)
成立.若
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406865554.png)
,則m的取值集合為____________.記數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406631415.png)
的前
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406912276.png)
項和為
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406927345.png)
,則使得
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406943734.png)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406959732.png)
的
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824025406990333.png)
的取值集合為____________.
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:填空題
已知等比數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824022144708481.png)
的前n項和為
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824022144724388.png)
,
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824022144771709.png)
,則
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824022144786604.png)
__________
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:單選題
在等比數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024927546456.png)
中,
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024927562870.png)
,則公比
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024927578310.png)
等于( )
A.2 | B.![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024927593338.png) | C.-2 | D.![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824024927609363.png) |
查看答案和解析>>