满分5 >
高中数学试题 >
等差数列{an}中,S9=-36,S13=-104,等比数列{bn}中,b5=a...
等差数列{an}中,S9=-36,S13=-104,等比数列{bn}中,b5=a5,b7=a7,则b6= .
考点分析:
相关试题推荐
已知|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037011_ST/0.png)
|=3,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037011_ST/1.png)
|=4,(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037011_ST/2.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037011_ST/3.png)
)•(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037011_ST/4.png)
+3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037011_ST/5.png)
)=33,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037011_ST/6.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037011_ST/7.png)
的夹角为
.
查看答案
过原点且倾斜角为150°的直线被圆x
2+y
2-4y=0所截得的弦长为
.
查看答案
如图所示,设点A是单位圆内的一定点,动点P从点A出发在圆上按逆时针方向旋转一周,点P所旋转过的弧
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037009_ST/0.png)
的长为l,原点O到弦AP的长为d,则函数d=f(l)的图象大致是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037009_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037009_ST/images2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037009_ST/images3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037009_ST/images4.png)
D.
查看答案
已知a<b,函数f(x)=sinx,g(x)=cosx.命题p:f(a)•f(b)<0,命题q:函数g(x)在区间(a,b)内有最值.则命题p是命题q成立的( )
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既不充分也不必要条件
查看答案
已知函数f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895203720/SYS201311031005498952037007_ST/0.png)
,若存在x
1,x
2∈R且f(x
1)=f(x
2)成立,则实数a的取值范围是( )
A.a<2
B.a<4
C.2≤a<4
D.a>2
查看答案