如图,平行六面体
中,
与
相交于M,设
、
、
,则
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/a0b1c840-956f-4034-8b4b-30d0f2f3c3b9.png?resizew=154)
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5f9be01066599267291ac0789ed388.png)
______ (用
、
、
表示);
(2)若
、
、
三向量是两两成
角的单位向量,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04d7a0a34913a97a3bd8fb07405c296a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a93a1399ff7a2bde342652479241b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b54aa2b7f9adf409f0ce8e00615432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a75216f7a68428fb8dd41221e854117.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/a0b1c840-956f-4034-8b4b-30d0f2f3c3b9.png?resizew=154)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5f9be01066599267291ac0789ed388.png)
![](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/bb573cc0f30d5c32cdad1510793f0e7b.png)
(2)若
![](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/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04d7a0a34913a97a3bd8fb07405c296a.png)
19-20高二下·广东江门·期中 查看更多[4]
广东省江门市第二中学2019-2020学年高二下学期期中数学试题(已下线)专题1.1 空间向量与空间向量基本定理(B卷提升篇)-2020-2021学年高二数学选择性必修第一册同步单元AB卷(新教材人教A版,浙江专用)(已下线)天津市南仓中学2023-2024学年高二上学期10月教学质量过程性检测数学试题北京市朝阳区北京工业大学附属中学2022-2023学年高二上学期10月月考数学试题
更新时间:2020-08-07 17:10:02
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【推荐2】给出命题:
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