已知正方体
的棱长为1,如图所示.
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521508038688768/2522059343011840/STEM/edcbb89b21674be789afb7f93bcf8034.png?resizew=227)
(1)求证:平面
平面
;
(2)试找出体对角线
与平面
和平面
的交点
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521508038688768/2522059343011840/STEM/edcbb89b21674be789afb7f93bcf8034.png?resizew=227)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f79d72a7034e21c87b1a76dbc4e7374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
(2)试找出体对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
19-20高一下·安徽六安·期末 查看更多[2]
更新时间:2020-08-06 16:45:46
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相似题推荐
解答题-证明题
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【推荐1】如图所示的多面体中, AC⊥BC,四边形ABED是正方形,平面ABED⊥平面ABC,点F,G,H分别为BD,EC,BE的中点,求证:
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378134618562560/2378375914545152/STEM/8449ed927b4e4f97b83a872471880cfe.png?resizew=113)
(1) BC⊥平面ACD
(2)平面HGF∥平面ABC.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378134618562560/2378375914545152/STEM/8449ed927b4e4f97b83a872471880cfe.png?resizew=113)
(1) BC⊥平面ACD
(2)平面HGF∥平面ABC.
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名校
【推荐2】已知
菱形
所在平面,
,
为线段
的中点,
为线段
上一点,且
.
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979754283843584/1980598250799104/STEM/6314f252095042a286faf8fa1484fa09.png?resizew=221)
(1)求证:
平面
;
(2)若
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af62a8c94bdc27efa2ec03e58d9400ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da87a0b35ba0ff6d762da1be4267f640.png)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979754283843584/1980598250799104/STEM/6314f252095042a286faf8fa1484fa09.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e60db93cd34a54c98da9ff9782656c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c161375e4e6f61f1cbef8083c02e975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e428dc8a84f07894b0c392832b18a8a.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图所示,已知三棱柱
中,D是
的中点,
是
的中点,设平面
平面
,平面
平面
,判断直线
的位置关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446fdb610d25bcc485b28d0e63633d6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8c2ff36a1d5181d8002541b7f8274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4a9ab83778460e10e82187817e9c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a0984f8d7360b7e767cdc356ed0618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d701d16d9f318ee8fa779f5b961d64c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/30370bf2-ed2b-41b0-bad7-239344f5b779.png?resizew=173)
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解答题-证明题
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(0.65)
名校
【推荐2】如图,在三棱柱
中,平面
平
,
,
,
.过
的平面交线段
于点E(不与端点重合),交线段BC于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/a7801a73-aa0a-466a-86bd-84c3291a31c3.png?resizew=201)
(1)求证:四边形
为平行四边形;
(2)若F为BC的中点,求直线与
与所成角的
正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002c709e9fee8d477bddfe595cc760f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e3c9e7c05de9838c0c5d762720d3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/a7801a73-aa0a-466a-86bd-84c3291a31c3.png?resizew=201)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bbb740f8bc13b4be8ca4dc0aef5442.png)
(2)若F为BC的中点,求直线与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27039783266a69df2a96ea0c36cbdcd5.png)
您最近一年使用:0次