满分5 >
高中数学试题 >
数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n≥1),则a6=(...
数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n≥1),则a6=( )
A.3×44
B.3×44+1
C.44
D.44+1
考点分析:
相关试题推荐
已知x,y满足线性约束条件
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190006_ST/0.png)
,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190006_ST/1.png)
=(x,-2),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190006_ST/2.png)
=(1,y),则z=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190006_ST/3.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190006_ST/4.png)
的最大值是( )
A.-1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190006_ST/5.png)
C.7
D.5
查看答案
若函数y=a
x+b的图象如图,则函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190005_ST/0.png)
的图象为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190005_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190005_ST/images2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190005_ST/images3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190005_ST/images4.png)
D.
查看答案
一机构为调查某地区中学生平均每人每周零花钱X(单位:元)的使用情况,分下列四种情况统计:①0≤X≤10;②10<X≤20;③20<X≤30;④X>30.调查了10000名中学生,如图是此次调查中某一项的流程图,其输出的结果是7300,则平均每人每周零花钱在[0,20]元内的学生的频率是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190004_ST/images0.png)
A.0.73
B.0.80
C.0.20
D.0.27
查看答案
已知命题p、q,则“命题p或q为真”是“命题p且q为真”的( )
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既不充分又不必要条件
查看答案
已知F
1、F
2为双曲线C:x
2-y
2=2的左、右焦点,点P在C上,|PF
1|=2|PF
2|,则cos∠F
1PF
2=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190002_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190002_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100003398019021/SYS201311031000033980190002_ST/2.png)
D.
查看答案