已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/0.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/1.png)
的夹角为30°,且|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/2.png)
|=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/3.png)
,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/4.png)
|=1,
(1)求|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/5.png)
-2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/6.png)
|的值;
(2)设向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/7.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/8.png)
+2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/9.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/10.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/11.png)
-2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/12.png)
,求向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/13.png)
在
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849120158008/SYS201311012248491201580016_ST/14.png)
方向上的投影.
考点分析:
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