满分5 >
高中数学试题 >
设定点F1(0,-3),F2(0,3),动点P(x,y)满足条件|PF1|+|P...
设定点F1(0,-3),F2(0,3),动点P(x,y)满足条件|PF1|+|PF2|=a(a>0),则动点P的轨迹是( )
A.椭圆
B.线段
C.不存在
D.椭圆或线段或不存在
考点分析:
相关试题推荐
抛物线y=4x
2的准线方程为( )
A.y=-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671483666/SYS201311012251346714836003_ST/0.png)
B.y=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671483666/SYS201311012251346714836003_ST/1.png)
C.y=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671483666/SYS201311012251346714836003_ST/2.png)
D.y=-
查看答案
已知命题P:∀x∈R,x>sinx,则P的否定形式为( )
A.P:∃x∈R,x≤sin
B.P:∀x∈R,x≤sin
C.P:∃x∈R,x<sin
D.P:∀x∈R,x<sin
查看答案
椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671483666/SYS201311012251346714836001_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671483666/SYS201311012251346714836001_ST/1.png)
=1的离心率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671483666/SYS201311012251346714836001_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671483666/SYS201311012251346714836001_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671483666/SYS201311012251346714836001_ST/4.png)
D.
查看答案
命题“方程|x|=1的解是x=±1”中,使用逻辑词的情况是( )
A.没有使用逻辑连接词
B.使用了逻辑连接词“或”
C.使用了逻辑连接词“且”
D.使用了逻辑连接词“或”与“且”
查看答案
设f(x)是定义在R上的函数,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671346777/SYS201311012251346713467020_ST/0.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671346777/SYS201311012251346713467020_ST/1.png)
(1)若f(x)=1,求g(x);
(2)若f(x)=x,求g(x).
查看答案