已知向量
在
方向上的投影为
,则![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331525632/STEM/51c2bceb76bf4d34b4df7f57ef164fb4.png?resizew=25)
_______ .
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331525632/STEM/187011a032c34c0fbfbaa08a6ea4ef40.png?resizew=59)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331525632/STEM/378f124ef1cd48e89b7ef7936ca9fe96.png?resizew=69)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331525632/STEM/6bee209ec3504b8ab05178453f8f857f.png?resizew=24)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331525632/STEM/51c2bceb76bf4d34b4df7f57ef164fb4.png?resizew=25)
更新时间:2016-12-04 22:16:56
|
【知识点】 平面向量的数量积
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