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函数y=x2-1(x≥0)的反函数是( ) A. B. C. D.
函数y=x
2-1(x≥0)的反函数是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248003_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248003_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248003_ST/3.png)
考点分析:
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向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248002_ST/0.png)
=(1,-2),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248002_ST/1.png)
=(6,3),则
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与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248002_ST/3.png)
的夹角为( )
A.60°
B.90°
C.120°
D.150°
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若a、b是任意实数,且a>b,则下列不等式成立的是( )
A.a
2>b
2B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248001_ST/0.png)
C.lg(a-b)>0
D.
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已知全集U={0,1,2,3,4,5,6,7,8,9},集合A={0,1,3,5,8},集合B={2,4,5,6,8},则(C
UA)∩(C
UB)=( )
A.{5,8}
B.{7,9}
C.{0,1,3}
D.{2,4,6}
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已知抛物线D的顶点是椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953481797/SYS201311031024079534817021_ST/0.png)
的中心,焦点与该椭圆的右焦点重合.
(Ⅰ)求抛物线D的方程;
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如图,正方形ABCD所在平面与圆O所在平面相交于CD,线段CD为圆O的弦,AE垂直于圆O所在平面,垂足E是圆O上异于C、D的点,AE=3,圆O的直径为9.
(1)求证:平面ABCD⊥平面ADE;
(2)求二面角D-BC-E的平面角的正切值.
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