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对于抛物线y2=4x上任意一点Q,点P(a,0)都满足|PQ|≥|a|,则a的取...
对于抛物线y2=4x上任意一点Q,点P(a,0)都满足|PQ|≥|a|,则a的取值范围是 .
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已知空间整数点的序列如下:(1,1,1)(1,1,2)(1,2,1)(2,1,1)(1,1,3)(1,3,1)(3,1,1)(1,2,2)(2,1,2)(2,2,1)(1,1,4)(1,4,1)(4,1,1)(1,2,3)则(1,5,1)是这个序列中的第
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向量
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,
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,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546143178532/SYS201311012315461431785010_ST/3.png)
,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546143178532/SYS201311012315461431785010_ST/4.png)
与
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的夹角为60°,则x
1-x
2=
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设M为抛物线x
2=-4y上的一个动点,则点到点(1,1)的距离与点M到直线y=1的距离之和的最小值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546143178532/SYS201311012315461431785009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546143178532/SYS201311012315461431785009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546143178532/SYS201311012315461431785009_ST/2.png)
D.2
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在棱长为a的正方体ABCD-A
1B
1C
1D
1中,D
1到平面ACB
1的距离为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546143178532/SYS201311012315461431785008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546143178532/SYS201311012315461431785008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546143178532/SYS201311012315461431785008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231546143178532/SYS201311012315461431785008_ST/2.png)
D.
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