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当m∈[-2,-1]时,二次曲线的离心率e的取值范围是( ) A.[] B.[]...
当m∈[-2,-1]时,二次曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697005_ST/0.png)
的离心率e的取值范围是( )
A.[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697005_ST/1.png)
]
B.[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697005_ST/2.png)
]
C.[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697005_ST/3.png)
]
D.[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697005_ST/4.png)
]
考点分析:
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的弦被点(2,2)平分,那么这条弦所在的直线的方程是( )
A.x+4y=0
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若平面α与β的法向量分别是
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,则平面α与β的位置关系是( )
A.平行
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已知空间四边形OABC,其对角线是OB,AC,M,N分别是对边OA,BC的中点,点G在线段MN上,且MG=3GN,用基底向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697002_ST/0.png)
表示向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697002_ST/1.png)
应是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697002_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697002_ST/3.png)
C.
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D.
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若k∈R,则“k≤-5”是“方程
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表示双曲线”的( )
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有4个命题:
①O,A,B,C为空间四点,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/0.png)
不构成空间的一个基底,那么点O,A,B,C一定共面
②若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/1.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/2.png)
共线,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/3.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/4.png)
共线,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/5.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/6.png)
共线
③若
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与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/8.png)
共面,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/9.png)
④若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224517685169763/SYS201311012245176851697000_ST/10.png)
,则P,M,A,B共面
其中,真命题的个数是( )
A.1
B.2
C.3
D.4
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