名校
解题方法
1 . 在三角形
中,
的三个内角
的对边分别是
,则下列给出的五个命题:
①若
,
,且
与
夹角为锐角,则
;
②若
,则
为等腰三角形;
③点O是三角形ABC所在平面内一点,且满足
,则点O是三角形ABC的重心;
④
,
,若
,则
为锐角三角形;
⑤若
为
的外心,
.
其中正确的命题是:_______________________ .(填写正确结论的编号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb506d2dc93b91a800f049fde9a6e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034b7e7a1cfe961a7f593bc1582b96cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e04b733c818593ed500c5fc9ccb2397.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e02e6946143207c276f7430942c1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
③点O是三角形ABC所在平面内一点,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec09a159d6760fca8ae5966bf97b4e49.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ebf59ed78b999efc06d97bc89038fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8592806a72eee278ce1086ea8145d096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1e552a1451270703a86e592d7dd656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9cc0ee2711b877dfef17bc89b410e2.png)
其中正确的命题是:
您最近一年使用:0次