已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551016_ST/0.png)
(1)求函数f(x)的单调递减区间.
(2)求函数f(x)的最大值,并求f(x)取得最大值时的x的集合.
(3)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551016_ST/1.png)
,求
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551016_ST/2.png)
的值.
考点分析:
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若集合
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551015_ST/0.png)
,B={(x,y)|y=k(x-2)+4},与A∩B有两个元素时,实数k的取值范围是
.
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已知数列{a
n}、{b
n}都是等差数列,S
n,T
n分别是它们的前n项和,并且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551014_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551014_ST/1.png)
=
.
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已知点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551013_ST/0.png)
,直线l:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551013_ST/1.png)
,点B是l上的动点,若过B垂直于y轴的直线与线段BF的垂直平分线交于点M,则点M的轨迹方程是
.
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已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551012_ST/0.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551012_ST/1.png)
的夹角为120°,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551012_ST/2.png)
,那么
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551012_ST/3.png)
的值为
.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551011_ST/images0.png)
如图,从双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223223563555144/SYS201311012232235635551011_ST/0.png)
的左焦点F引圆x
2+y
2=a
2的切线,切点为T,延长FT交双曲线右支于P点,若M为线段FP的中点,O为坐标原点,则|MO|-|MT|与b-a的大小关系为( )
A.|MO|-|MT|>b-a
B.|MO|-|MT|<b-a
C.|MO|-|MT|=b-a
D.以上三种可能都有
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