设实数x,y满足x+y=4,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635013_ST/0.png)
的最小值为
.
考点分析:
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已知两条直线l
1:y=m 和 l
2:y=
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(m>0),l
1与函数y=|log
2x|的图象从左至右相交于点A,B,l
2 与函数y=|log
2x|的图象从左至右相交于点C,D.记线段AC和BD在X轴上的投影长度分别为a,b,当m变化时,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635011_ST/1.png)
的最小值为( )
A.16
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635011_ST/2.png)
B.8
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635011_ST/3.png)
C.8
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635011_ST/4.png)
D.4
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设函数f(x)=sin(ωx+φ)+cos(ωx+φ)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635010_ST/0.png)
的最小正周期为π,且f(-x)=f(x),则( )
A.f(x)在
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单调递减
B.f(x)在(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635010_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635010_ST/3.png)
)单调递减
C.f(x)在(0,
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)单调递增
D.f(x)在(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635010_ST/5.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635010_ST/6.png)
)单调递增
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六名运动员站在6条跑道上准备参加比赛,其中甲不能站在第一道也不能站在第二道,乙必须站在第五道或第六道,则不同排法种数为( )
A.144
B.96
C.72
D.48
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在△ABC中,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635008_ST/0.png)
,则以A、B为焦点且过点C的双曲线的离心率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635008_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095800361563550/SYS201311030958003615635008_ST/3.png)
D.
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