已知O为坐标原点,点A(2,1),B(1,2),对于k∈N
*有向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822019_ST/0.png)
=k
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822019_ST/1.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822019_ST/2.png)
,
(1)试问点P
k是否在同一条直线上,若是,求出该直线的方程;若不是,请说明理由;
(2)是否在存在k∈N
*使P
k在圆x
2+(y-2)
2=5上或其内部,若存在求出k,若不存在说明理由.
考点分析:
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822018_ST/0.png)
=(1,-2),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822018_ST/1.png)
=(-3,2),
(1)求(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822018_ST/2.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822018_ST/3.png)
)•(
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-2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822018_ST/5.png)
)的值.
(2)当k为何值时,k
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822018_ST/6.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822018_ST/7.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822018_ST/8.png)
-3
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平行?平行时它们是同向还是反向?
查看答案
已知向量a,b满足|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822017_ST/0.png)
|=2,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822017_ST/1.png)
|=1,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822017_ST/2.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822017_ST/3.png)
|=2.
(1)求
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822017_ST/4.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822017_ST/5.png)
的值;
(2)求|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822017_ST/6.png)
+
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|的值.
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设α、β为锐角,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822016_ST/0.png)
=(sinα,-cosα),
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=(-cosβ,sinβ),
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=(
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,
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),求
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•
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和cos(α+β)的值.
查看答案
在平面直角坐标系xOy中,设A、B、C是圆x
2+y
2=1上相异三点,若存在正实数λ,μ,使得
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=
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,则λ
2+(μ-3)
2的取值范围是
.
查看答案
定理:三角形的外心O、重心G、垂心H依次在同一条直线(欧拉线)上,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822014_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822014_ST/1.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212982256/SYS201310251237212129822014_ST/2.png)
,其中外心O是三条边的中垂线的交点,重心G是三条边的中线的交点,垂心H是三条高的交点.如图,在△ABC中,AB>AC,AB>BC,M是边BC的中点,AH⊥BC(N是垂足),O是外心,G是重心,H是垂心,OM=1,则根据定理可求得
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的最大值是
.
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