2022高一·全国·专题练习
1 . (1)已知△ABC的外心为O,且AB=5,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3f49b89d0a2a30c824e55f9fb42453.png)
______ .
(2)已知△ABC的重心为O,且AB=5,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3f49b89d0a2a30c824e55f9fb42453.png)
______ .
(3)已知△ABC的重心为O,且AB=5,
,
,D为BC中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09416fe254bcdca88e0466429a56d16b.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3f49b89d0a2a30c824e55f9fb42453.png)
(2)已知△ABC的重心为O,且AB=5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3f49b89d0a2a30c824e55f9fb42453.png)
(3)已知△ABC的重心为O,且AB=5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c65bea2c80af038768b74250c694e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09416fe254bcdca88e0466429a56d16b.png)
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