已知椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183557596392586/SYS201310241835575963925022_ST/0.png)
的长轴为4,且点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183557596392586/SYS201310241835575963925022_ST/1.png)
在该椭圆上.
(I)求椭圆的方程;
(II)过椭圆右焦点的直线l交椭圆于A,B两点,若以AB为直径的圆径的圆经过原点,求直线l的方程.
考点分析:
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(I)求证:AO⊥平面BCD;
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已知函数f(x)=2sinωxcosωx-2cos
2ωx(x∈R,ω>0),相邻两条对称轴之间的距离等于
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(Ⅰ)求
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的值;
(Ⅱ)当
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时,求函数f(x)的最大值和最小值及相应的x值.
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将函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183557596392586/SYS201310241835575963925019_ST/0.png)
的图象向右平移a(a>0)个单位,所得图象的函数为偶函数,则a的最小值为 ( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183557596392586/SYS201310241835575963925019_ST/1.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183557596392586/SYS201310241835575963925019_ST/3.png)
D.
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[理科]观察下列式子:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183557596392586/SYS201310241835575963925018_ST/0.png)
,
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183557596392586/SYS201310241835575963925018_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183557596392586/SYS201310241835575963925018_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183557596392586/SYS201310241835575963925018_ST/5.png)
D.
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关于x、y的二元一次方程组
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183557596392586/SYS201310241835575963925017_ST/0.png)
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A.充分非必要条件
B.必要非充分条件
C.充分且必要条件
D.既非充分也非必要条件
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