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设,为单位向量.且、的夹角为,若=+3,=2,则向量在方向上的射影为 .
设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/1.png)
为单位向量.且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/2.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/3.png)
的夹角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/4.png)
,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/5.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/6.png)
+3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/7.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/8.png)
=2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/9.png)
,则向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/10.png)
在
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053011_ST/11.png)
方向上的射影为
.
考点分析:
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如图,半径为1的半圆O与等边三角形ABC夹在两平行线l
1,l
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A.
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B.
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C.
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D.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053008_ST/0.png)
)引直线l与曲线y=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053008_ST/1.png)
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053008_ST/2.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822105382/SYS201310251243238221053008_ST/4.png)
D.
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