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以椭圆2x2+y2=1的顶点为焦点,以椭圆的焦点为顶点的双曲线方程为 .
以椭圆2x2+y2=1的顶点为焦点,以椭圆的焦点为顶点的双曲线方程为 .
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椭圆
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的右焦点F,直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223252976874435/SYS201311012232529768744011_ST/1.png)
与x轴的交点为A,在椭圆上存在点P满足线段AP的垂直平分线过点F,则椭圆离心率的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223252976874435/SYS201311012232529768744011_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223252976874435/SYS201311012232529768744011_ST/3.png)
C.
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D.
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已知{a
n}为等差数列,a
1+a
3+a
5=105,a
2+a
4+a
6=99,以S
n表示{a
n}的前n项和,则使得S
n达到最大值的n是( )
A.21
B.20
C.19
D.18
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已知双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223252976874435/SYS201311012232529768744009_ST/0.png)
(a>0)的中心在原点,右焦点与抛物线y
2=16x的焦点重合,则该双曲线的离心率等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223252976874435/SYS201311012232529768744009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223252976874435/SYS201311012232529768744009_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223252976874435/SYS201311012232529768744009_ST/3.png)
D.
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已知函数
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,则不等式f(x)≥x
2的解集是( )
A.[-1,1]
B.[-2,2]
C.[-2,1]
D.[-1,2]
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已知抛物线y
2=4x的焦点为F,准线与x轴的交点为M,N为抛物线上的一点,且|NF|=
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|MN|,则∠NMF=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223252976874435/SYS201311012232529768744007_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223252976874435/SYS201311012232529768744007_ST/2.png)
C.
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D.
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