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k∈R,则方程组( ) A.有且仅有一组实数解 B.有且仅有两组不同的实数解 C...
k∈R,则方程组
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( )
A.有且仅有一组实数解
B.有且仅有两组不同的实数解
C.有两组解,但不一定都是实数解
D.由于k为参数,以上情况均有可能出现
考点分析:
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已知点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598012_ST/0.png)
,动点P到点M(1,0)比到y轴距离大1,其轨迹为曲线C,且线段AB与曲线C存在公共点,则a得取值范围是( )
A.(-∞,+∞)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598012_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598012_ST/2.png)
D.
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正方体ABCD-A
1B
1C
1D
1的棱长为1,点M在AB上,且AM=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598011_ST/0.png)
,点P是平面ABCD上的动点,且动点P到直线A
1D
1的距离与动点P到点M的距离的平方差为1,则动点的轨迹是( )
A.圆
B.抛物线
C.双曲线
D.直线
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已知F
1,F
2为双曲线左,右焦点,以双曲线右支上任意一点P为圆心,以|PF
1|为半径的圆与以F
2为圆心,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598010_ST/0.png)
|F
1F
2|为半径的圆内切,则双曲线两条渐近线的夹角是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598010_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598010_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598010_ST/3.png)
D.
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椭圆x
2+my
2=1的焦点在y轴上,长轴长是短轴长的两倍,则m的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598009_ST/1.png)
C.2
D.4
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焦点为(0,6),且与双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598008_ST/0.png)
有相同的渐近线的双曲线方程是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598008_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222906682159883/SYS201311012229066821598008_ST/3.png)
D.
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