已知在平面直角坐标系xoy中,向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950011_ST/0.png)
,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950011_ST/1.png)
.
(I)设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950011_ST/2.png)
的取值范围;
(II)设以原点O为中心,对称轴在坐标轴上,以F为右焦点的椭圆经过点M,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950011_ST/3.png)
取最小值时,求椭圆的方程.
考点分析:
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已知A、B、C是直线l上的三点,向量
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满足
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,则函数y=f(x)的表达式为
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已知△ABC的三边长分别为AB=7,BC=5,CA=6,则
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的值为
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已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950008_ST/0.png)
=(4,3),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950008_ST/1.png)
=(x,-4),且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950008_ST/2.png)
⊥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950008_ST/3.png)
,则x=
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如图,A、B分别是射线OM,ON上的两点,给出下列向量:
①
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950007_ST/0.png)
;②
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950007_ST/1.png)
;③
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950007_ST/2.png)
;④
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950007_ST/3.png)
;⑤
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950007_ST/4.png)
.
这些向量中以O为起点,终点在阴影区域内的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950007_ST/images5.png)
A.①②
B.①④
C.①③
D.⑤
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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/20131023211906352195038/SYS201310232119063521950006_ST/0.png)
,点Q是AC的中点,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211906352195038/SYS201310232119063521950006_ST/1.png)
,
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,则
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=( )
A.(-2,7)
B.(-6,21)
C.(2,-7)
D.(6,-21)
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