解题方法
1 . 设向量
,
不平行,
,
,
,若
三点共线,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b35811bc17681bb510bb593e0b3c1fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51fea4893a644a4ad32fd24aeb7db44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1af5cf37763cdf51105b761d524c741a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65183d238c9bc2be73770717d890683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
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2 . 已知在△ABC中,AD是∠BAC的角平分线,与BC交于点D,M是AD的中点,延长BM交AC于点H,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab20bdd00691b9b8d664c947437ff55.png)
___________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/becf5b8bf645e3e337c149695def2414.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd8c4f5c151f79824629281f0f288a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b714bbc5628e1df56a18d75d2d0a5baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab20bdd00691b9b8d664c947437ff55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/becf5b8bf645e3e337c149695def2414.png)
您最近一年使用:0次
2022-03-23更新
|
191次组卷
|
2卷引用:福建省龙岩市长汀县第一中学2021-2022学年高一下学期第一次月考数学试题
名校
3 . 在
中有如下结论:“若点
为
的重心,则
”.设
分别为内角
的对边,点
为
的重心. 若
,则内角
的大小为_________ ;当
时,
的面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953bbd281e02da9e2e4a0a13843b94a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dedb5376262d69e5e3a22c9df0d8dfe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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2021-03-29更新
|
92次组卷
|
2卷引用:福建省连城县第一中学2020-2021学年高一下学期第一次月考数学试题
名校
解题方法
4 . 在
中,
,则
的最小角的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b9c16061566a50f5af08f63f1756cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2021-09-03更新
|
273次组卷
|
2卷引用:福建省龙岩市第一中学2022届高三上学期第一次半月考数学试题