满分5 >
高中数学试题 >
在等比数列{an}中,若a1,a10是方程3x2-2x-6=0的两根,则a4a7...
在等比数列{an}中,若a1,a10是方程3x2-2x-6=0的两根,则a4a7= .
考点分析:
相关试题推荐
对于向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/2.png)
及实数x,y,x
1,x
2,λ,给出下列四个条件:
①
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/3.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/4.png)
=3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/5.png)
且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/6.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/7.png)
=5
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/8.png)
; ②x
1![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/9.png)
+x
2![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/10.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/11.png)
③
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/12.png)
=λ
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/13.png)
(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/14.png)
≠
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/15.png)
)且λ唯一; ④x
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/16.png)
+y
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/17.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/18.png)
(x+y=0)
其中能使
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/19.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502009_ST/20.png)
共线的是( )
A.①②
B.②④
C.①③
D.③④
查看答案
已知D是△ABC所在平面内一点,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502008_ST/0.png)
,则( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502008_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502008_ST/3.png)
D.
查看答案
设函数f(x)=cosωx(ω>0),将y=f(x)的图象向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502007_ST/0.png)
个单位长度后,所得的图象与原图象重合,则ω的最小值等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502007_ST/1.png)
B.3
C.6
D.9
查看答案
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/20131103102711456550204/SYS201311031027114565502006_ST/0.png)
,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/1.png)
=(x,-2),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/2.png)
=(1,y),则z=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/3.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/4.png)
的最大值是( )
A.-1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/5.png)
C.7
D.5
查看答案
设函数f(x)=xsinx+cosx的图象在点(t,f(t))处切线的斜率为k,则函数k=g(t)的部分图象为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502005_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502005_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502005_ST/images2.png)
D.
查看答案