如图,在空间直角坐标系中有长方体
,且
,
,
,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf42e1391da5b2a4d692140b9c95242e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900b844294e8c07ea9a858adb845121c.png)
21-22高二·全国·课后作业 查看更多[3]
(已下线)4.3 用向量方法研究立体几何中的度量关系北师大版(2019)选择性必修第一册课本习题第三章4.3用向量方法研究立体几何中的度量关系北师大版(2019)选择性必修第一册课本例题4.3 用向量方法研究立体几何中的度量关系
更新时间:2022-03-07 23:57:47
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【知识点】 异面直线夹角的向量求法
相似题推荐
解答题-证明题
|
较易
(0.85)
解题方法
【推荐1】如图,在棱长为1的正方体
中,
分别为
的中点,点
在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/33a57982-8056-4cf0-b736-7397ee7177af.png?resizew=158)
(1)求证:
;
(2)求
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b866a756d422faec0f7eb229dfaabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0635059fd390592d1851dfe56c72cd6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/33a57982-8056-4cf0-b736-7397ee7177af.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d435974639ea2850bb5c21efe64b123b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fec5bd77cfc1313bc200480cc66c766.png)
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解答题-问答题
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较易
(0.85)
名校
解题方法
【推荐2】如图,在平行六面体
中,
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7046ea5ec8bb0f777482b086d181e2e9.png)
.求
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd21a4e45dc1beb069d7e78f84a51544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7046ea5ec8bb0f777482b086d181e2e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432aca761e9fa97d3728a8038de81e5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037b1a3ec2e37bbcb05d0a467efb511.png)
![](https://img.xkw.com/dksih/QBM/2021/2/6/2652428197216256/2652451885441024/STEM/a41513dd-276e-4027-b87e-979845627015.png?resizew=220)
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解答题-证明题
|
较易
(0.85)
名校
【推荐3】如图,梯形
中,
,
,
,沿对角线
将
折起,使点
在平面
内的射影
恰在
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/a2c2c725-57dc-499c-adda-4208baf85b05.png?resizew=326)
(Ⅰ)求证:
面
;
(Ⅱ)求异面直线
与
所成的角;
(Ⅲ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7998fce147e53c3a65b17d182a4b48a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40eb326c96c22db416b1f5ec223076f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/a2c2c725-57dc-499c-adda-4208baf85b05.png?resizew=326)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(Ⅱ)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(Ⅲ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd29cc627d76412c236aac6b29fa0fdf.png)
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