椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637238531/SYS201311031000296372385000_ST/0.png)
(φ是参数)的离心率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637238531/SYS201311031000296372385000_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637238531/SYS201311031000296372385000_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637238531/SYS201311031000296372385000_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637238531/SYS201311031000296372385000_ST/4.png)
考点分析:
相关试题推荐
在数列{a
n}中,a
1=2,a
n+1=a
n+cn(其中c是非零常数),n=1,2,3,…),a
1,a
2,a
3成公比不为1的等比数列
(1)求常数c的值;
(2)数列{
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637049960/SYS201311031000296370499020_ST/0.png)
}的前n项和为S
n,求证:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637049960/SYS201311031000296370499020_ST/1.png)
.
查看答案
在△ABC中,已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637049960/SYS201311031000296370499019_ST/0.png)
.
(1)求证:△ABC是等腰三角形;
(2)求AB边的长;
(3)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637049960/SYS201311031000296370499019_ST/1.png)
,求△ABC的面积.
查看答案
已知方程x
2+y
2-2x-4y+m=0
(1)若此方程表示圆,求实数m的取值范围;
(2)若(1)中的圆与直线x+2y-4=0相交于M、N两点,且坐标原点O在以MN为径的圆上,求实数m的值.
查看答案
如图,正三棱柱ABC-A
1B
1C
1的所有棱长都为2,D为CC
1的中点.
(1)求证:AB
1⊥平面A
1BD;
(2)求三棱锥B-A
1B
1D的体积.
查看答案
已知f(x)=|x
2-1|+x
2+kx.
(I)若k=2,求方程f(x)=0的解;
(II)若关于x的方程f(x)=0在(0,2)上有两个解x
1,x
2,求k的取值范围,并证明
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100029637049960/SYS201311031000296370499016_ST/0.png)
.
查看答案