解题方法
1 . 设AD,BE,CF是
的三条中线.
(1)用
和
表示
;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd98a891fa65f2fc6688001b03185d0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3556b1f44b66c4217a18b2f13492d265.png)
您最近一年使用:0次
名校
2 . 已知两个非零向量
不共线,
.
(1)证明:
三点共线;
(2)试确定实数
,使
与
共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d184ae171c511d3ab7eebb7dbb4eae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f773b5ebfaf2c5c6624a323f7e4a99.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1378530dfec264f4bf99a179826dc957.png)
(2)试确定实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea1f268299d57e5362182760a5961af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f200069e313c5863a4efab246fd347a.png)
您最近一年使用:0次
2019-10-09更新
|
949次组卷
|
3卷引用:宁夏银川市贺兰县景博中学2020-2021学年高一下学期期中考试数学试题