1 . 如图,在
中,
,
,
,点
是
的中点,记
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960733796605952/2962882932318208/STEM/7c05596f18bb402a8e684f357829ab74.png?resizew=213)
(1)用
,
表示
,
;
(2)求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dc094d7d08769ca721691e4fabfe89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a93a1399ff7a2bde342652479241b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae92f0c583cc9daf980a8621ad96aef5.png)
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960733796605952/2962882932318208/STEM/7c05596f18bb402a8e684f357829ab74.png?resizew=213)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ed9c2e9fabbfc63733bae8fa079d00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd0cecf5c102254b9755e42a80c3948.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
您最近一年使用:0次
2022-04-21更新
|
478次组卷
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2卷引用:山西省太原市2021-2022学年高一下学期期中数学试题
2 . 设平面内三点
.
(1)求向量
的坐标;
(2)若四边形
为平行四边形,求点
坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11228a07d4e58f9cd88592edf2b24851.png)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0bdc6a560eadbc7b3038ccaec12b93.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
您最近一年使用:0次
2022-03-23更新
|
1028次组卷
|
4卷引用:山西省沁源县第一中学、榆社第一中学2021-2022学年高一下学期3月月考数学试题