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若点P到直线x=-1的距离比它到点(2,0)的距离小1,则点P的轨迹为( ) A...
若点P到直线x=-1的距离比它到点(2,0)的距离小1,则点P的轨迹为( )
A.圆
B.椭圆
C.双曲线
D.抛物线
考点分析:
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有以下命题:
①如果向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063004_ST/0.png)
与任何向量不能构成空间向量的一组基底,那么
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063004_ST/1.png)
的关系是不共线;
②O,A,B,C为空间四点,且向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063004_ST/2.png)
不构成空间的一个基底,那么点O,A,B,C一定共面;
③已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063004_ST/3.png)
是空间的一个基底,则向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063004_ST/4.png)
,也是空间的一个基底.
其中正确的命题是( )
A.①②
B.①③
C.②③
D.①②③
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063003_ST/images0.png)
如图:在平行六面体ABCD-A
1B
1C
1D
1中,M为A
1C
1与B
1D
1的交点.若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063003_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063003_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063003_ST/2.png)
,则下列向量中与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063003_ST/3.png)
相等的向量是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063003_ST/4.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063003_ST/5.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063003_ST/6.png)
D.
查看答案
已知命题p:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063002_ST/0.png)
,则( )
A.¬p:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063002_ST/1.png)
B.¬p:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063002_ST/2.png)
C.¬p:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063002_ST/3.png)
D.¬p:
查看答案
已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063001_ST/0.png)
=(1,1,0),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063001_ST/1.png)
=(-1,0,2),且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063001_ST/2.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063001_ST/3.png)
互相垂直,则k的值是( )
A.1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063001_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431418806300/SYS201311031014314188063001_ST/5.png)
D.
查看答案
若a∈R,则a=2是(a-1)(a-2)=0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