若曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355012_ST/0.png)
表示双曲线,则k的取值范围是
.
考点分析:
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如图过抛物线y
2=2px(p>0)的焦点F的直线依次交抛物线及准线于点A,B,C,若|BC|=2|BF|,且|AF|=3,则抛物线的方程为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355011_ST/images0.png)
A.y
2=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355011_ST/0.png)
B.y
2=9
C.y
2=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355011_ST/1.png)
D.y
2=3
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设过点P(x,y)的直线分别与x轴的正半轴和y轴的正半轴交于A,B两点,点Q与点P关于y轴对称,O为坐标原点,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355010_ST/0.png)
且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355010_ST/1.png)
,则点P的轨迹方程是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355010_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355010_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355010_ST/4.png)
D.
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若直线y=kx+2与双曲线x
2-y
2=6的左支交于不同的两点,那么k的取值范围是( )
A.(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355009_ST/0.png)
)
B.(-1,1)
C.(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355009_ST/1.png)
)
D.(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355009_ST/2.png)
)
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已知椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/0.png)
(a>b>0)与双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/1.png)
(m>0,n>0)有相同的焦点(-c,0)和(c,0),若c是a、m的等比中项,n
2是2m
2与c
2的等差中项,则椭圆的离心率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/4.png)
D.
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已知双曲线:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355007_ST/0.png)
,则以A(1,1)为中点的双曲线的弦所在的直线方程为( )
A.3x-y-2=0
B.x-3y+2=0
C.3x+y-2=0
D.不存在
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