已知四面体
的各棱长均为1,D是棱OA的中点,E是棱AB的中点,设
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/87ffb349-9c4f-45be-9c94-53d583b6b0cd.png?resizew=187)
(1)用向量
、
、
表示
、
;
(2)判断
与
是否垂直;
(3)求异面直线BD与CE所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211429ce394297f664f6b8e16edec714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff2809b448b246cfd11bba7a003c8311.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/87ffb349-9c4f-45be-9c94-53d583b6b0cd.png?resizew=187)
(1)用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4781e3daa2c4e018ca0ae09bb56abc0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0735144f6e24b6b32028ff14c17c1cec.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4781e3daa2c4e018ca0ae09bb56abc0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0735144f6e24b6b32028ff14c17c1cec.png)
(3)求异面直线BD与CE所成的角.
22-23高二上·上海青浦·期末 查看更多[2]
更新时间:2023-01-15 06:17:35
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【推荐2】如图,已知空间四边形
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