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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,...
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
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124117571505275/SYS201310251241175715052014_ST/0.png)
,则该球表面积为
.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124117571505275/SYS201310251241175715052014_ST/images1.png)
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在约束条件
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下,过点(1,1)目标函数z取得最大值10,则目标函数z=
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已知cos2θ=
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,则sin
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已知以T=4为周期的函数
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,其中m>0,若方程3f(x)=x恰有5个实数解,则m的取值范围为( )
A.(
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B.(
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,
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从点P出发的三条射线PA,PB,PC两两成60°角,且分别与球O相切于A,B,C三点,若球的体积为
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,则OP两点之间的距离为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124117571505275/SYS201310251241175715052010_ST/1.png)
B.
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C.
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D.2
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点P到点
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及到直线
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的距离都相等,如果这样的点恰好只有一个,那么a的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124117571505275/SYS201310251241175715052009_ST/2.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124117571505275/SYS201310251241175715052009_ST/4.png)
D.
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