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若a=log3π,b=log76,c=log20.8,则( ) A.a>b>c ...
若a=log3π,b=log76,c=log20.8,则( )
A.a>b>c
B.b>a>c
C.c>a>b
D.b>c>a
考点分析:
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设向量
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,则下列结论中正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919273969736/SYS201311012309192739697003_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919273969736/SYS201311012309192739697003_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919273969736/SYS201311012309192739697003_ST/3.png)
与
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垂直
D.
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cos300°=( )
A.1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919273969736/SYS201311012309192739697001_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919273969736/SYS201311012309192739697001_ST/1.png)
D.
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设集合U={1,2,3,4},A={1,2},B={2,4},则∁
U(A∪B)=( )
A.{2}
B.{3}
C.{1,2,4}
D.{1,4}
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如图所示,在正三棱柱ABC-A
1B
1C
1中,AB=AC=BC=BB
1=2,D点为棱AB的中点.
(1)求证:AC
1∥平面CDB
1(2)求BB
1与平面CDB
1所成角的正切值.
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