计算:
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=
.
考点分析:
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在△ABC中,点P在BC上,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081011_ST/0.png)
,点Q是AC的中点,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081011_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081011_ST/2.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081011_ST/3.png)
=( )
A.(-2,7)
B.(-6,21)
C.(2,-7)
D.(6,-21)
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在△ABC中,AB=3,AC=5,若O为△ABC的外心,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081010_ST/0.png)
=( )
A.34
B.16
C.8
D.0
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设tanα、tanβ是方程x
2+3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081009_ST/0.png)
x+4=0的两根,且α、β∈(-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081009_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081009_ST/2.png)
),则α+β的值为( )
A.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081009_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081009_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081009_ST/5.png)
或-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081009_ST/6.png)
D.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081009_ST/7.png)
或
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函数y=cos(ωx+φ)(ω>0,0<φ<π)为奇函数,该函数的部分图象如图所表示,A、B分别为最高点与最低点,并且两点间的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081008_ST/0.png)
,则该函数的一条对称轴为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081008_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081008_ST/2.png)
C.x=1
D.x=2
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下列函数既是奇函数,又在区间[-1,1]上单调递减的是( )
A.f(x)=sin
B.f(x)=-|x+1|
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081007_ST/0.png)
D.
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