如图,在空间直角坐标系中有长方体
,且
,
,
,求平面
与平面ABD所成二面角的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe8e63ddb5ce5c0a6d81b22b2175155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657d5471e57b894c3833bb3f43ff38ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5fc547cd267d76463fb8820749b59b.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】 面面角的向量求法
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在三棱柱
中,
平面
,
,
,
,
为
的中点,
为
上靠近
的三等分点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/0f4bd0cd-dad4-402c-a629-2f50e01a20c4.png?resizew=117)
(1)求证:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d97f616f0f32beed421129cbbb4db8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/0f4bd0cd-dad4-402c-a629-2f50e01a20c4.png?resizew=117)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e7a3d6eadcf4e7be0c6ba280c11c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ddb188f48bcd955d3bc33f7cf72db5d.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,直四棱柱
中,底面ABCD是正方形,
,点E,F分别在线段
,
上,且
,G为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/858faf94-08c3-4891-bbc3-84238c49925b.png?resizew=109)
(1)若
,点
在线段EF上,证明:
平面ACG;
(2)
,求平面ACG与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033006332d004ee62a51841500ca1133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/858faf94-08c3-4891-bbc3-84238c49925b.png?resizew=109)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3447dd6a7f3264470b189e047eb7c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/014973e890e8f37de1bf8a050475d4fa.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/584aaf6d3cbf142b33b4a3c1f3ed80c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d47e5be88e89d0d042c56d2d6942b0.png)
您最近一年使用:0次