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已知正四棱柱ABCD-A1B1C1D1的高为,外接球的体积是,则A、B两点的球面...
已知正四棱柱ABCD-A
1B
1C
1D
1的高为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420930743711/SYS201311031024209307437014_ST/0.png)
,外接球的体积是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420930743711/SYS201311031024209307437014_ST/1.png)
,则A、B两点的球面距离为
.
考点分析:
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若函数
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在[-1,1]上是单调增函数,则实数a的取值范围是
.
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设O为坐标原点,A(1,2),若点B(x,y)满足
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取得最小值时,点B的坐标是
.
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定义f(M)=(m,n,p),其中M是△ABC内一点,m、n、p分别是△MBC、△MCA、△MAB的面积,已知△ABC中,
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420930743711/SYS201311031024209307437011_ST/1.png)
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的最小值是( )
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C.16
D.18
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四棱锥P-ABCD的三视图如图所示,四棱锥P-ABCD的五个顶点都在一个球面上,E、F分别是棱AB、CD的中点,直线EF被球面所截得的线段长为
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设F
1、F
2分别是椭圆
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+
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=1(a>b>0)的左、右焦点,与直线y=b相切的⊙F
2交椭圆于E,且E是直线EF
1与⊙F
2的切点,则椭圆的离心率为( )
A.
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B.
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C.
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D.
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