已知向量
,若![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/eb69af3dbcea42e78f54e056290217ee.png?resizew=28)
,则![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/454d315a575548ac9dd2fd46fb42b9cc.png?resizew=26)
______ ;若![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/91ecd13a1a824ac089118fbdcfa530e8.png?resizew=26)
,则![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/454d315a575548ac9dd2fd46fb42b9cc.png?resizew=26)
______ .
![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/4fc1836ae4b84103a12ce06a0e739ab8.png?resizew=166)
![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/eb69af3dbcea42e78f54e056290217ee.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/1ad44043405640daad5c5092d875c36c.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/454d315a575548ac9dd2fd46fb42b9cc.png?resizew=26)
![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/91ecd13a1a824ac089118fbdcfa530e8.png?resizew=26)
![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/1ad44043405640daad5c5092d875c36c.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2016/1/25/1572465539530752/1572465545003008/STEM/454d315a575548ac9dd2fd46fb42b9cc.png?resizew=26)
更新时间:2016-12-04 01:32:15
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【知识点】 向量在几何中的应用
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解题方法
【推荐1】已知
中的内角为
,重心为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd1fcfad659e95da18c38e5eb157b8.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4754b4873ffd8a7f3904e626d82e0ac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd1fcfad659e95da18c38e5eb157b8.png)
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