名校
解题方法
1 . 在
中,
是
的中点,
是
的中点,过点
作一直线
分别与边
,
交于
,
,若
,则
的最小值是( )
![](https://img.xkw.com/dksih/QBM/2021/8/22/2791876354523136/2817845466464256/STEM/804437bda4fc408b98e79e7c68fbe0aa.png?resizew=166)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0b8c8e570cd3045e23ac9b72497c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/407e4330cfdd5cd0bcfd4f3bd1a898e6.png)
![](https://img.xkw.com/dksih/QBM/2021/8/22/2791876354523136/2817845466464256/STEM/804437bda4fc408b98e79e7c68fbe0aa.png?resizew=166)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2021-09-28更新
|
691次组卷
|
5卷引用:江苏省盐城市滨海县八滩中学2020-2021学年高一下学期期中模拟数学试题
2 . 已知向量
,
满足
,
,
.
(1)求向量
与
的夹角;
(2)求
的值;
(3)若向量
,
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3551e9998e13f08a21bee1e2cefa5e62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce800552d72d0762f70aabf8bcf7425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dc173e86408b076d087d605fe0b8690.png)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb6118172f384a565afcdfd84e9cdb0.png)
(3)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c03a48abe5ee5ba769c94ce447e6ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d778826b061c9f6c3e97ab6fe7e07257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6faf60be7e54aacf10289640a02f9a8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2020-08-06更新
|
524次组卷
|
3卷引用:江苏省盐城市滨海县八滩中学2020-2021学年高一下学期期中模拟数学试题