等差数列
等比数列
定义
通项公式
性质
前n项和
,
广东高考文科数学真题
1. 小题
1. (2014年13)等比数列的各项均为正数,且,则 ________.
2. (2013广东,文11)设数列{an}是首项为1,公比为-2的等比数列,则a1+|a2|+a3+|a4|=___
3. (2012年广东11).若等比数列
满足
,则
_______________.
4. (2011年广东11)已知
是递增等比数列,
,则此数列的公比
.
5. (2010年广东4)已知数列{
}为等比数列,
是它的前n项和,若
,且
与
的等差中项为
,则S5=
A.35 B.33 C.31 D.29
6.(2009年5)已知等比数列
的公比为正数,且
·
=2
,
=1,则
=
A.
B.
C.
D.2
7.(2008年广东5)记等差数列
的前
项和为
,若
,
,则该数列的公差
( )
A.2
B.3
C.6
D.7
8. (2007年广东13)已知数列{an}的前n项和Sn=n2-9n,则其通项an= ;若它的第k项满足5
0,数列
满足
,
.
(1) 求数列
的通项公式;
(2) 证明:对于一切正整数
,
.
设b>0,数列
满足
,
.
(3) 求数列
的通项公式;
(4) 证明:对于一切正整数
,
.
解:
,
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