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某学院的A,B,C三个专业共有1200名学生,为了调查这些学生勤工俭学的情况,拟...
某学院的A,B,C三个专业共有1200名学生,为了调查这些学生勤工俭学的情况,拟采用分层抽样的方法抽取一个容量为120的样本.已知该学院的A专业有380名学生,B专业有420名学生,则在该学院的C专业应抽取 名学生.
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若椭圆
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的左、右焦点分别为F
1、F
2,线段F
1F
2被抛物线y
2=2bx的焦点分成5:3两段,则此椭圆的离心率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737009_ST/2.png)
C.
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D.
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抛物线y=x
2上一点到直线2x-y-4=0的距离最短的点的坐标是( )
A.(1,1)
B.(
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)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737008_ST/1.png)
D.(2,4)
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在同一坐标系中,方程a
2x
2+b
2y
2=1与ax+by
2=0(a>b>0)的曲线大致是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737007_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737007_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737007_ST/images2.png)
D.
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已知双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737006_ST/0.png)
(mn≠0)的离心率为2,有一个焦点恰好是抛物线y
2=4x的焦点,则此双曲线的渐近线方程是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737006_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737006_ST/2.png)
C.3x±y=0
D.x±3y=0
查看答案
设双曲线的焦点在x轴上,两条渐近线为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737005_ST/0.png)
,则双曲线的离心率e=( )
A.5
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158473772/SYS201311031024481584737005_ST/2.png)
D.
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